Mark flaky test as flaky.

chrome/browser/extensions/content_script_apitest.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/extension.h"
@@ skipping 61 matching lines @@
   ui_test_utils::GetCurrentTabTitle(browser(), &title);
   EXPECT_EQ(std::string("PASS"), UTF16ToUTF8(title));
 }
 
 // crbug.com/39249 -- content scripts js should not run on view source.
 IN_PROC_BROWSER_TEST_F(ExtensionApiTest, ContentScriptViewSource) {
   ASSERT_TRUE(StartTestServer());
   ASSERT_TRUE(RunExtensionTest("content_scripts/view_source")) << message_;
 }
 
+#if defined (OS_CHROMEOS)
+IN_PROC_BROWSER_TEST_F(
+    ExtensionApiTest,
+    FLAKY_ContentScriptStylesInjectedIntoExistingRenderers) {
+#else
 IN_PROC_BROWSER_TEST_F(
     ExtensionApiTest, ContentScriptStylesInjectedIntoExistingRenderers) {
+#endif
   ASSERT_TRUE(StartTestServer());
 
   ui_test_utils::WindowedNotificationObserver signal(
       chrome::NOTIFICATION_USER_SCRIPTS_UPDATED,
       content::Source<Profile>(browser()->profile()));
 
   // Start with a renderer already open at a URL.
   GURL url(test_server()->GetURL("file/extensions/test_file.html"));
   ui_test_utils::NavigateToURL(browser(), url);
 
@@ skipping 36 matching lines @@
   ui_test_utils::NavigateToURL(
       browser(), test_server()->GetURL("events.html"));
 
   // Navigate to an extension page that will fire the event events.js is
   // listening for.
   ui_test_utils::NavigateToURLWithDisposition(
       browser(), extension->GetResourceURL("fire_event.html"),
       NEW_FOREGROUND_TAB, ui_test_utils::BROWSER_TEST_NONE);
   EXPECT_TRUE(catcher.GetNextResult());
 }