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

chrome/browser/browsing_data/browsing_data_remover_browsertest.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 <stddef.h>
 #include <memory>
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/files/file_path.h"
 #include "base/path_service.h"
 #include "base/run_loop.h"
+#include "base/threading/thread_restrictions.h"
 #include "chrome/browser/browsing_data/browsing_data_helper.h"
 #include "chrome/browser/browsing_data/browsing_data_remover.h"
 #include "chrome/browser/browsing_data/browsing_data_remover_factory.h"
 #include "chrome/browser/browsing_data/browsing_data_remover_test_util.h"
 #include "chrome/browser/browsing_data/cache_counter.h"
 #include "chrome/browser/browsing_data/chrome_browsing_data_remover_delegate.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/external_protocol/external_protocol_handler.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
@@ skipping 47 matching lines @@
 
   void VerifyDownloadCount(size_t expected) {
     content::DownloadManager* download_manager =
         content::BrowserContext::GetDownloadManager(browser()->profile());
     std::vector<content::DownloadItem*> downloads;
     download_manager->GetAllDownloads(&downloads);
     EXPECT_EQ(expected, downloads.size());
   }
 
   void DownloadAnItem() {
+    base::ThreadRestrictions::ScopedAllowIO allow_io;
     base::ScopedTempDir downloads_directory;
     ASSERT_TRUE(downloads_directory.CreateUniqueTempDir());
     browser()->profile()->GetPrefs()->SetFilePath(
         prefs::kDownloadDefaultDirectory, downloads_directory.GetPath());
 
     // Start a download.
     content::DownloadManager* download_manager =
         content::BrowserContext::GetDownloadManager(browser()->profile());
     std::unique_ptr<content::DownloadTestObserver> observer(
         new content::DownloadTestObserverTerminal(
@@ skipping 226 matching lines @@
   BrowserThread::PostTaskAndReply(
       BrowserThread::IO, FROM_HERE,
       base::BindOnce(
           &BrowsingDataRemoverTransportSecurityStateBrowserTest::
               CheckTransportSecurityState,
           base::Unretained(this),
           base::RetainedRef(browser()->profile()->GetRequestContext()),
           false /* should not be cleared */),
       run_loop.QuitClosure());
 }