Gmail mails get modified upon send due to certain extensions

chrome/browser/extensions/content_script_apitest.cc

 // Copyright (c) 2011 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 "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "content/browser/tab_contents/tab_contents.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/test/ui_test_utils.h"
 #include "googleurl/src/gurl.h"
 #include "net/base/mock_host_resolver.h"
 
 IN_PROC_BROWSER_TEST_F(ExtensionApiTest, ContentScriptAllFrames) {
   ASSERT_TRUE(StartTestServer());
   ASSERT_TRUE(RunExtensionTest("content_scripts/all_frames")) << message_;
 }
 
+IN_PROC_BROWSER_TEST_F(ExtensionApiTest, ContentScriptAboutBlankIframes) {
+  ASSERT_TRUE(StartTestServer());
+  ASSERT_TRUE(
+      RunExtensionTest("content_scripts/about_blank_iframes")) << message_;
+}
+
 IN_PROC_BROWSER_TEST_F(ExtensionApiTest, ContentScriptExtensionIframe) {
   ASSERT_TRUE(StartTestServer());
   ASSERT_TRUE(RunExtensionTest("content_scripts/extension_iframe")) << message_;
 }
 
 IN_PROC_BROWSER_TEST_F(ExtensionApiTest, ContentScriptExtensionProcess) {
   ASSERT_TRUE(StartTestServer());
   ASSERT_TRUE(
       RunExtensionTest("content_scripts/extension_process")) << message_;
 }
@@ skipping 49 matching lines @@
   // And check that its styles were affected by the styles that just got loaded.
   bool styles_injected;
   ASSERT_TRUE(ui_test_utils::ExecuteJavaScriptAndExtractBool(
       browser()->GetSelectedTabContents()->render_view_host(), L"",
       L"window.domAutomationController.send("
       L"document.defaultView.getComputedStyle(document.body, null)."
       L"getPropertyValue('background-color') == 'rgb(255, 0, 0)')",
       &styles_injected));
   ASSERT_TRUE(styles_injected);
 }