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

chrome/browser/ui/webui/policy_ui_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 <stddef.h>
 
 #include <memory>
 #include <utility>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/json/json_reader.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/run_loop.h"
+#include "base/threading/thread_restrictions.h"
 #include "base/values.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/test_extension_system.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "chrome/test/base/ui_test_utils.h"
 #include "components/policy/core/browser/browser_policy_connector.h"
@@ skipping 246 matching lines @@
                              values.Get(kUnknownPolicy),
                              true));
 
   // Retrieve the contents of the policy table from the UI and verify that it
   // matches the expectation.
   VerifyPolicies(expected_policies);
 }
 
 IN_PROC_BROWSER_TEST_F(PolicyUITest, ExtensionLoadAndSendPolicy) {
   ui_test_utils::NavigateToURL(browser(), GURL(chrome::kChromeUIPolicyURL));
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
   base::ScopedTempDir temp_dir_;
   ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
 
   const std::string newly_added_policy_name = "new_policy";
   std::string json_data = "{\"type\": \"object\",\"properties\": {\"" +
                           newly_added_policy_name +
                           "\": { \"type\": \"string\"}}}";
 
   const std::string schema_file = "schema.json";
   base::FilePath schema_path = temp_dir_.GetPath().AppendASCII(schema_file);
@@ skipping 31 matching lines @@
         PopulateExpectedPolicy(
             it.key(), std::string(), std::string(), nullptr, false));
   }
   // Add newly added policy to expected policy list.
   expected_policies.push_back(PopulateExpectedPolicy(
       newly_added_policy_name, std::string(), std::string(), nullptr, false));
 
   // Verify if policy UI includes policy that extension have.
   VerifyPolicies(expected_policies);
 }