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

chrome/browser/extensions/api/i18n/i18n_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 "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/threading/thread_restrictions.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/test/base/ui_test_utils.h"
 #include "extensions/common/extension.h"
 #include "extensions/test/result_catcher.h"
 #include "net/test/embedded_test_server/embedded_test_server.h"
 
 IN_PROC_BROWSER_TEST_F(ExtensionApiTest, I18N) {
   ASSERT_TRUE(StartEmbeddedTestServer());
   ASSERT_TRUE(RunExtensionTest("i18n")) << message_;
 }
 
 IN_PROC_BROWSER_TEST_F(ExtensionApiTest, I18NUpdate) {
   ASSERT_TRUE(embedded_test_server()->Start());
   // Create an Extension whose messages.json file will be updated.
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
   base::ScopedTempDir extension_dir;
   ASSERT_TRUE(extension_dir.CreateUniqueTempDir());
   base::CopyFile(
       test_data_dir_.AppendASCII("i18nUpdate").AppendASCII("manifest.json"),
       extension_dir.GetPath().AppendASCII("manifest.json"));
   base::CopyFile(
       test_data_dir_.AppendASCII("i18nUpdate").AppendASCII("contentscript.js"),
       extension_dir.GetPath().AppendASCII("contentscript.js"));
   base::CopyDirectory(
       test_data_dir_.AppendASCII("i18nUpdate").AppendASCII("_locales"),
@@ skipping 22 matching lines @@
 
   // Check that the i18n message is also changed.
   ui_test_utils::NavigateToURL(
       browser(),
       embedded_test_server()->GetURL("/extensions/test_file.html"));
   EXPECT_TRUE(catcher.GetNextResult());
 
   ui_test_utils::GetCurrentTabTitle(browser(), &title);
   EXPECT_EQ(std::string("SECONDMESSAGE"), base::UTF16ToUTF8(title));
 }