Fix integration tests in src/chrome and src/extensions so that we can turn on IO thread checks wi...

chrome/browser/extensions/api/web_navigation/web_navigation_apitest.cc

 // 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 <list>
 #include <set>
 
 #include "base/files/scoped_temp_dir.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/threading/thread_restrictions.h"
 #include "build/build_config.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_browser_main.h"
 #include "chrome/browser/chrome_browser_main_extra_parts.h"
 #include "chrome/browser/chrome_content_browser_client.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/download/download_browsertest.h"
 #include "chrome/browser/download/download_prefs.h"
 #include "chrome/browser/extensions/api/web_navigation/web_navigation_api.h"
@@ skipping 373 matching lines @@
 }
 
 // http://crbug.com/660288
 IN_PROC_BROWSER_TEST_F(WebNavigationApiTest, DISABLED_ServerRedirect) {
   ASSERT_TRUE(StartEmbeddedTestServer());
   ASSERT_TRUE(RunExtensionTest("webnavigation/serverRedirect"))
       << message_;
 }
 
 IN_PROC_BROWSER_TEST_F(WebNavigationApiTest, Download) {
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
   base::ScopedTempDir download_directory;
   ASSERT_TRUE(download_directory.CreateUniqueTempDir());
   DownloadPrefs* download_prefs =
       DownloadPrefs::FromBrowserContext(browser()->profile());
   download_prefs->SetDownloadPath(download_directory.GetPath());
 
   DownloadTestObserverNotInProgress download_observer(
       content::BrowserContext::GetDownloadManager(profile()), 1);
   download_observer.StartObserving();
   ASSERT_TRUE(StartEmbeddedTestServer());
@@ skipping 388 matching lines @@
           "extensions/api_test/webnavigation/crash/b.html",
       embedded_test_server()->port()));
   ui_test_utils::NavigateToURL(browser(), url);
 
   ASSERT_TRUE(catcher.GetNextResult()) << catcher.message();
 }
 
 #endif
 
 }  // namespace extensions