[ios] Disable iOS13 context menu tests.

Bug: 976259
Change-Id: I6f487fd16096209478be37be0bb8aa9e7ea859c9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1726793
Auto-Submit: Justin Cohen <justincohen@chromium.org>
Commit-Queue: Peter Lee <pkl@chromium.org>
Reviewed-by: Peter Lee <pkl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682430}

ios/chrome/browser/context_menu/context_menu_egtest.mm

@@ -162,6 +162,13 @@ void SelectTabAtIndexInCurrentMode(NSUInteger index) {
 
 @implementation ContextMenuTestCase
 
+// TODO(crbug.com/976259) Disable broken context menu tests on Xcode 11 beta 5.
++ (NSArray*)testInvocations {
+  if (@available(iOS 13, *))
+    return @[];
+  return [super testInvocations];
+}
+
 + (void)setUp {
   [super setUp];
   [ChromeEarlGrey setContentSettings:CONTENT_SETTING_ALLOW];

ios/web/shell/test/context_menu_egtest.mm

@@ -38,6 +38,13 @@ const char kHtmlFile[] =
 
 @implementation ContextMenuTestCase
 
+// TODO(crbug.com/976259) Disable broken context menu tests on Xcode 11 beta 5.
++ (NSArray*)testInvocations {
+  if (@available(iOS 13, *))
+    return @[];
+  return [super testInvocations];
+}
+
 - (void)setUp {
   [super setUp];