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

chrome/browser/themes/theme_service_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 "chrome/browser/themes/theme_service.h"
 
 #include "base/macros.h"
 #include "base/threading/sequenced_worker_pool.h"
+#include "base/threading/thread_restrictions.h"
 #include "chrome/browser/extensions/component_loader.h"
 #include "chrome/browser/extensions/extension_browsertest.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/themes/theme_properties.h"
 #include "chrome/browser/themes/theme_service_factory.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/common/pref_names.h"
 #include "components/prefs/pref_service.h"
 
 namespace {
@@ skipping 42 matching lines @@
 
   // Check that the theme was installed.
   EXPECT_TRUE(UsingCustomTheme(*theme_service));
   EXPECT_EQ(kThemeToolbarColor,
             theme_provider.GetColor(ThemeProperties::COLOR_TOOLBAR));
   EXPECT_NE(base::FilePath(),
             profile->GetPrefs()->GetFilePath(prefs::kCurrentThemePackFilename));
   // Add a vestigial .pak file that should be removed when the new one is
   // created.
   // TODO(estade): remove when vestigial .pak file deletion is removed.
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
   EXPECT_EQ(
       1, base::WriteFile(profile->GetPrefs()
                              ->GetFilePath(prefs::kCurrentThemePackFilename)
                              .AppendASCII("Cached Theme Material Design.pak"),
                          "a", 1));
 
   // Change the theme data pack path to an invalid location such that second
   // part of the test is forced to recreate the theme pack when the theme
   // service is initialized.
   profile->GetPrefs()->SetFilePath(
@@ skipping 11 matching lines @@
             theme_provider.GetColor(ThemeProperties::COLOR_TOOLBAR));
 
   // TODO(estade): remove when vestigial .pak file deletion is removed.
   content::BrowserThread::GetBlockingPool()->FlushForTesting();
   base::FilePath old_path =
       browser()
           ->profile()
           ->GetPrefs()
           ->GetFilePath(prefs::kCurrentThemePackFilename)
           .AppendASCII("Cached Theme Material Design.pak");
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
   EXPECT_FALSE(base::PathExists(old_path)) << "File not deleted: "
                                            << old_path.value();
 }
 
 }  // namespace