Fix a crash when loading a multipart html page.

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 "base/utf_string_conversions.h"
 #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/chrome_notification_types.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/test/base/ui_test_utils.h"
+#include "content/browser/tab_contents/tab_contents.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());
@@ skipping 30 matching lines @@
 }
 
 IN_PROC_BROWSER_TEST_F(ExtensionApiTest, ContentScriptIgnoreHostPermissions) {
   host_resolver()->AddRule("a.com", "127.0.0.1");
   host_resolver()->AddRule("b.com", "127.0.0.1");
   ASSERT_TRUE(StartTestServer());
   ASSERT_TRUE(RunExtensionTest(
       "content_scripts/dont_match_host_permissions")) << message_;
 }
 
+IN_PROC_BROWSER_TEST_F(
+    ExtensionApiTest, ContentScriptInjectedIntoMultipartPage) {
+  ASSERT_TRUE(StartTestServer());
+
+  // Start with a renderer already open at a URL.
+  GURL url(test_server()->GetURL("multipart-slow"));
+  ui_test_utils::NavigateToURL(browser(), url);
+
+  string16 title;
+  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_;
 }
 
 IN_PROC_BROWSER_TEST_F(
     ExtensionApiTest, ContentScriptStylesInjectedIntoExistingRenderers) {
   ASSERT_TRUE(StartTestServer());
 
@@ skipping 18 matching lines @@
       L"document.defaultView.getComputedStyle(document.body, null)."
       L"getPropertyValue('background-color') == 'rgb(255, 0, 0)')",
       &styles_injected));
   ASSERT_TRUE(styles_injected);
 }
 
 IN_PROC_BROWSER_TEST_F(ExtensionApiTest, ContentScriptCSSLocalization) {
   ASSERT_TRUE(StartTestServer());
   ASSERT_TRUE(RunExtensionTest("content_scripts/css_l10n")) << message_;
 }