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

chrome/browser/policy/cloud/component_cloud_policy_browsertest.cc

 // Copyright (c) 2013 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 <string>
 
 #include "base/base64url.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/path_service.h"
 #include "base/run_loop.h"
+#include "base/threading/thread_restrictions.h"
 #include "build/build_config.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/extension_browsertest.h"
 #include "chrome/browser/policy/profile_policy_connector.h"
 #include "chrome/browser/policy/profile_policy_connector_factory.h"
 #include "chrome/browser/policy/test/local_policy_test_server.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/common/chrome_paths.h"
 #include "components/policy/core/browser/browser_policy_connector.h"
@@ skipping 285 matching lines @@
 
   // Verify that the policy cache exists.
   std::string cache_key;
   base::Base64UrlEncode(
       "extension-policy", base::Base64UrlEncodePolicy::INCLUDE_PADDING,
       &cache_key);
   std::string cache_subkey;
   base::Base64UrlEncode(
       kTestExtension, base::Base64UrlEncodePolicy::INCLUDE_PADDING,
       &cache_subkey);
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
   base::FilePath cache_path = browser()->profile()->GetPath()
       .Append(FILE_PATH_LITERAL("Policy"))
       .Append(FILE_PATH_LITERAL("Components"))
       .AppendASCII(cache_key)
       .AppendASCII(cache_subkey);
   EXPECT_TRUE(base::PathExists(cache_path));
 
   // Now sign-out. The policy cache should be removed, and the extension should
   // get an empty policy update.
   ExtensionTestMessageListener event_listener("event", true);
@@ skipping 73 matching lines @@
   ExtensionTestMessageListener policy_listener1("{}", true);
   event_listener_->Reply("get-policy-Name");
   EXPECT_TRUE(policy_listener1.WaitUntilSatisfied());
 
   ExtensionTestMessageListener policy_listener2(kTestPolicy2JSON, false);
   policy_listener1.Reply("get-policy-Another");
   EXPECT_TRUE(policy_listener2.WaitUntilSatisfied());
 }
 
 }  // namespace policy