[Extensions] Remove obsolete test.

The ExtensionApiTest.ContentScriptStylesInjectedIntoExistingRenderers
was disabled on 2012-06-22 for being flaky. It is no longer a valid
test.

Bug: 120762
Change-Id: Id3b89ec7e04a83c1b38cea3d671672b7ca3277c7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2132670Reviewed-by: Kelvin Jiang <kelvinjiang@chromium.org>
Commit-Queue: David Bertoni <dbertoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756807}

chrome/browser/extensions/content_script_apitest.cc

@@ -326,36 +326,6 @@ IN_PROC_BROWSER_TEST_F(ContentScriptCssInjectionTest,
   EXPECT_TRUE(CheckStyleInjection(browser(), url, false));
 }
 
-// crbug.com/120762
-IN_PROC_BROWSER_TEST_F(
-    ExtensionApiTest,
-    DISABLED_ContentScriptStylesInjectedIntoExistingRenderers) {
-  ASSERT_TRUE(StartEmbeddedTestServer());
-
-  content::WindowedNotificationObserver signal(
-      extensions::NOTIFICATION_USER_SCRIPTS_UPDATED,
-      content::Source<Profile>(browser()->profile()));
-
-  // Start with a renderer already open at a URL.
-  GURL url(embedded_test_server()->GetURL("/extensions/test_file.html"));
-  ui_test_utils::NavigateToURL(browser(), url);
-
-  LoadExtension(
-      test_data_dir_.AppendASCII("content_scripts/existing_renderers"));
-
-  signal.Wait();
-
-  // And check that its styles were affected by the styles that just got loaded.
-  bool styles_injected;
-  ASSERT_TRUE(content::ExecuteScriptAndExtractBool(
-      browser()->tab_strip_model()->GetActiveWebContents(),
-      "window.domAutomationController.send("
-      "    document.defaultView.getComputedStyle(document.body, null)."
-      "        getPropertyValue('background-color') == 'rgb(255, 0, 0)')",
-      &styles_injected));
-  ASSERT_TRUE(styles_injected);
-}
-
 IN_PROC_BROWSER_TEST_F(ContentScriptApiTest, ContentScriptCSSLocalization) {
   ASSERT_TRUE(StartEmbeddedTestServer());
   ASSERT_TRUE(RunExtensionTest("content_scripts/css_l10n")) << message_;

chrome/test/data/extensions/api_test/content_scripts/existing_renderers/content_styles.css

-body {
-  background: red;
-}

chrome/test/data/extensions/api_test/content_scripts/existing_renderers/manifest.json

-{
-  "name": "Existing Renderers",
-  "version": "1.0",
-  "manifest_version": 2,
-  "description": "Tests that styles specified by content scripts are injected and applied into existing renderers.",
-  "content_scripts": [ {
-    "css": [ "content_styles.css" ],
-    "matches": [ "<all_urls>" ]
-  }]
-}