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

chrome/test/base/web_ui_browser_test.cc

 // Copyright 2014 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/test/base/web_ui_browser_test.h"
 
 #include <stddef.h>
 
 #include <string>
 #include <vector>
 
 #include "base/lazy_instance.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/path_service.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/threading/thread_restrictions.h"
 #include "base/values.h"
 #include "chrome/browser/chrome_content_browser_client.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_commands.h"
 #include "chrome/browser/ui/browser_navigator_params.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/browser/ui/webui/web_ui_test_handler.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/url_constants.h"
@@ skipping 458 matching lines @@
   test_handler_->RegisterMessages();
 
   if (GetMockMessageHandler()) {
     GetMockMessageHandler()->set_web_ui(web_ui_instance);
     GetMockMessageHandler()->RegisterMessages();
   }
 }
 
 GURL WebUIBrowserTest::WebUITestDataPathToURL(
     const base::FilePath::StringType& path) {
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
   base::FilePath dir_test_data;
   EXPECT_TRUE(PathService::Get(chrome::DIR_TEST_DATA, &dir_test_data));
   base::FilePath test_path(dir_test_data.Append(kWebUITestFolder).Append(path));
   EXPECT_TRUE(base::PathExists(test_path));
   return net::FilePathToFileURL(test_path);
 }