Clean up pak loading.

- kEmptyPakContents was malformed; fix it
- chrome.pak was deleted half a year ago for iOS Chrome; don't try to load it

BUG=410411
TEST=no visible change

Review URL: https://codereview.chromium.org/611103002

Cr-Commit-Position: refs/heads/master@{#297210}

ui/base/resource/data_pack_literal.cc

@@ -51,7 +51,8 @@ extern const size_t kSamplePakSize2x = sizeof(kSamplePakContents2x);
 extern const char kEmptyPakContents[] = {
     0x04, 0x00, 0x00, 0x00,               // header(version
     0x00, 0x00, 0x00, 0x00,               //        no. entries
-    0x01
+    0x01,                                 //        encoding)
+    0x00, 0x00, 0x0f, 0x00, 0x00, 0x00    // extra entry for the size of last
 };
 
 extern const size_t kEmptyPakSize = sizeof(kEmptyPakContents);

ui/base/resource/resource_bundle_ios.mm

@@ -44,9 +44,6 @@ base::FilePath GetResourcesPakFilePath(NSString* name, NSString* mac_locale) {
 }  // namespace
 
 void ResourceBundle::LoadCommonResources() {
-  AddDataPackFromPath(GetResourcesPakFilePath(@"chrome", nil),
-                      ui::SCALE_FACTOR_NONE);
-
   if (IsScaleFactorSupported(SCALE_FACTOR_100P)) {
     AddDataPackFromPath(GetResourcesPakFilePath(@"chrome_100_percent", nil),
                         SCALE_FACTOR_100P);