Fix misspelling "existance"

third_party/ is excluded, except for third_party/WebKit and
third_party/blink.

This is uncovered by:
https://chromium-swarm.appspot.com/task?id=3f2afb7b4290f910

Bug: None
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:ios-simulator-full-configs;luci.chromium.try:win_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Ie17ea50e7f6aba3538acb488df92b4926b52f4c4
Reviewed-on: https://chromium-review.googlesource.com/1170441Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582384}

.gn

@@ -259,7 +259,7 @@ check_targets = [
 # additions, we keep the build fast and clean. If you think you need to add a
 # new call, please consider:
 #
-# - Do not use a script to check for the existance of a file or directory to
+# - Do not use a script to check for the existence of a file or directory to
 #   enable a different mode. Instead, use GN build args to enable or disable
 #   functionality and set options. An example is checking for a file in the
 #   src-internal repo to see if the corresponding src-internal feature should

cc/layers/texture_layer_impl.h

@@ -64,7 +64,7 @@ class CC_EXPORT TextureLayerImpl : public LayerImpl {
       std::unique_ptr<viz::SingleReleaseCallback> release_callback);
 
   // These methods notify the display compositor, through the
-  // CompositorFrameSink, of the existance of a SharedBitmapId and its
+  // CompositorFrameSink, of the existence of a SharedBitmapId and its
   // mapping to a SharedMemory in |bitmap|. Then this SharedBitmapId can be used
   // in TransferableResources inserted on the layer while it is registered. If
   // the layer is destroyed, the SharedBitmapId will be unregistered

cc/trees/layer_tree_settings.h

@@ -145,7 +145,7 @@ class CC_EXPORT LayerTreeSettings {
   // Whether to use edge anti-aliasing for all layer types that supports it.
   bool enable_edge_anti_aliasing = true;
 
-  // Whether to request presentation time regardless if existance of
+  // Whether to request presentation time regardless if existence of
   // presentation time callbacks.
   bool always_request_presentation_time = false;
 

components/metrics/persistent_system_profile.h

@@ -48,7 +48,7 @@ class PersistentSystemProfile {
 
   // Retrieves the system profile from a persistent memory allocator. Returns
   // true if a profile was successfully retrieved. If null is passed for the
-  // |system_profile|, only a basic check for the existance of one will be
+  // |system_profile|, only a basic check for the existence of one will be
   // done.
   static bool GetSystemProfile(
       const base::PersistentMemoryAllocator& memory_allocator,

ios/chrome/browser/ui/browser_view_controller.mm

@@ -2313,7 +2313,7 @@ applicationCommandEndpoint:(id<ApplicationCommands>)applicationCommandEndpoint {
   }
 
   // Only add leading and trailing constraints once as they are never updated.
-  // This uses the existance of |primaryToolbarOffsetConstraint| as a proxy for
+  // This uses the existence of |primaryToolbarOffsetConstraint| as a proxy for
   // whether we've already added the leading and trailing constraints.
   if (!self.primaryToolbarOffsetConstraint) {
     [NSLayoutConstraint activateConstraints:@[

third_party/WebKit/LayoutTests/external/wpt/user-timing/measure.html

@@ -76,7 +76,7 @@
 
         function onload_test()
         {
-            // test for existance of User Timing and Performance Timeline interface
+            // test for existence of User Timing and Performance Timeline interface
             if (!has_required_interfaces())
             {
                 test_true(false,

third_party/WebKit/LayoutTests/external/wpt/user-timing/measure_navigation_timing.html

@@ -73,7 +73,7 @@
 
         function onload_test()
         {
-            // test for existance of User Timing and Performance Timeline interface
+            // test for existence of User Timing and Performance Timeline interface
             if (!has_required_interfaces())
             {
                 test_true(false,

third_party/WebKit/LayoutTests/http/tests/devtools/extensions/multiple-extensions-expected.txt

-Tests co-existance of multiple DevTools extensions
+Tests co-existence of multiple DevTools extensions
 
 Started extension.
 Running tests...

third_party/WebKit/LayoutTests/http/tests/devtools/extensions/multiple-extensions.js

@@ -3,7 +3,7 @@
 // found in the LICENSE file.
 
 (async function() {
-  TestRunner.addResult(`Tests co-existance of multiple DevTools extensions\n`);
+  TestRunner.addResult(`Tests co-existence of multiple DevTools extensions\n`);
   await TestRunner.loadModule('extensions_test_runner');
 
   const tests = [

third_party/WebKit/LayoutTests/jquery/resources/test/unit/traversing.js

@@ -366,9 +366,9 @@ test("prevUntil([String])", function() {
 test("contents()", function() {
 	expect(12);
 	equals( jQuery("#ap").contents().length, 9, "Check element contents" );
-	ok( jQuery("#iframe").contents()[0], "Check existance of IFrame document" );
+	ok( jQuery("#iframe").contents()[0], "Check existence of IFrame document" );
 	var ibody = jQuery("#loadediframe").contents()[0].body;
-	ok( ibody, "Check existance of IFrame body" );
+	ok( ibody, "Check existence of IFrame body" );
 
 	equals( jQuery("span", ibody).text(), "span text", "Find span in IFrame and check its text" );
 

third_party/blink/renderer/modules/webdatabase/sqlite/sqlite_file_system_posix.cc

@@ -249,7 +249,7 @@ int ChromiumDelete(sqlite3_vfs*, const char* file_name, int sync_dir) {
                                                  sync_dir);
 }
 
-// Check the existance and status of the given file.
+// Check the existence and status of the given file.
 //
 // vfs - pointer to the sqlite3_vfs object.
 // fileName - the name of the file.

third_party/blink/renderer/modules/webdatabase/sqlite/sqlite_file_system_win.cc

@@ -83,7 +83,7 @@ int ChromiumDelete(sqlite3_vfs*, const char* file_name, int) {
                                                  false);
 }
 
-// Check the existance and status of the given file.
+// Check the existence and status of the given file.
 //
 // vfs - pointer to the sqlite3_vfs object.
 // fileName - the name of the file.

third_party/blink/renderer/modules/xr/xr_device.cc

@@ -76,7 +76,7 @@ ScriptPromise XRDevice::supportsSession(
   // Check to see if the device is capable of supporting the requested session
   // options. Note that reporting support here does not guarantee that creating
   // a session with those options will succeed, as other external and
-  // time-sensitve factors (focus state, existance of another immersive session,
+  // time-sensitve factors (focus state, existence of another immersive session,
   // etc.) may prevent the creation of a session as well.
   const char* reject_reason = checkSessionSupport(options);
   if (reject_reason) {

tools/chrome_proxy/webdriver/protocol_fuzz.py

@@ -130,7 +130,7 @@ STATIC_RESPONSE_HEADERS = {
 }
 
 # This string will be used as the response body in every test and will be
-# checked for existance on the final loaded page.
+# checked for existence on the final loaded page.
 STATIC_RESPONSE_BODY = 'ok'
 
 rand_str_re = re.compile(r'{{RAND_STR\((\d+)\)}}')