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

chrome/browser/sessions/session_restore_browsertest.cc

 // Copyright 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 <set>
 #include <vector>
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/macros.h"
 #include "base/memory/memory_pressure_listener.h"
 #include "base/memory/ptr_util.h"
 #include "base/process/launch.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/threading/thread_restrictions.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "chrome/browser/defaults.h"
 #include "chrome/browser/download/download_prefs.h"
 #include "chrome/browser/first_run/first_run.h"
 #include "chrome/browser/lifetime/keep_alive_types.h"
 #include "chrome/browser/lifetime/scoped_keep_alive.h"
 #include "chrome/browser/prefs/session_startup_pref.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
@@ skipping 1414 matching lines @@
   EXPECT_TRUE(
       controller->GetDefaultSessionStorageNamespace()->should_persist());
 
   // Quit and restore. Check that no extra tabs were created.
   Browser* new_browser = QuitBrowserAndRestore(browser(), 1);
   ASSERT_EQ(1u, active_browser_list_->size());
   EXPECT_EQ(1, new_browser->tab_strip_model()->count());
 }
 
 IN_PROC_BROWSER_TEST_F(SessionRestoreTest, TabWithDownloadDoesNotGetRestored) {
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
   base::ScopedTempDir download_directory;
   ASSERT_TRUE(download_directory.CreateUniqueTempDir());
   ASSERT_TRUE(embedded_test_server()->Start());
   ASSERT_EQ(Browser::TYPE_TABBED, browser()->type());
 
   DownloadPrefs* download_prefs =
       DownloadPrefs::FromBrowserContext(browser()->profile());
   download_prefs->SetDownloadPath(download_directory.GetPath());
   GURL first_download_url =
       embedded_test_server()->GetURL("/downloads/a_zip_file.zip");
@@ skipping 150 matching lines @@
   // automatically at the start of the test.
   for (size_t i = 1; i < web_contents().size(); i++) {
     GURL expected_url = GURL(kUrls[activation_order[kExpectedNumTabs - i]]);
     ASSERT_EQ(expected_url, web_contents()[i]->GetLastCommittedURL());
     if (i > 0) {
       ASSERT_GT(web_contents()[i - 1]->GetLastActiveTime(),
                 web_contents()[i]->GetLastActiveTime());
     }
   }
 }