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

chrome/browser/sync/test/integration/single_client_directory_sync_test.cc

 // Copyright (c) 2014 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_enumerator.h"
 #include "base/files/file_path.h"
 #include "base/location.h"
 #include "base/macros.h"
 #include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/synchronization/waitable_event.h"
+#include "base/threading/thread_restrictions.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/time/time.h"
 #include "chrome/browser/sync/test/integration/bookmarks_helper.h"
 #include "chrome/browser/sync/test/integration/single_client_status_change_checker.h"
 #include "chrome/browser/sync/test/integration/sync_test.h"
 #include "chrome/browser/sync/test/integration/updated_progress_marker_checker.h"
 #include "components/browser_sync/profile_sync_service.h"
 #include "components/sync/syncable/directory.h"
 #include "content/public/browser/browser_thread.h"
 #include "sql/test/test_helpers.h"
 #include "url/gurl.h"
 
 using content::BrowserThread;
 using base::FileEnumerator;
 using base::FilePath;
 
 namespace {
 
 // USS ModelTypeStore uses the same folder as the Directory. However, all of its
 // content is in a sub-folder. By not asking for recursive files, this function
 // will avoid seeing any of those, and return iff Directory database files still
 // exist.
 bool FolderContainsFiles(const FilePath& folder) {
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
   if (base::DirectoryExists(folder)) {
     return !FileEnumerator(folder, false, FileEnumerator::FILES).Next().empty();
   } else {
     return false;
   }
 }
 
 class SingleClientDirectorySyncTest : public SyncTest {
  public:
   SingleClientDirectorySyncTest() : SyncTest(SINGLE_CLIENT) {}
@@ skipping 91 matching lines @@
   ASSERT_TRUE(SyncUnrecoverableErrorChecker(sync_service).Wait());
   ASSERT_TRUE(sync_service->HasUnrecoverableError());
 
   // Wait until the sync loop has processed any existing tasks and see that the
   // directory no longer exists.
   ASSERT_TRUE(WaitForExistingTasksOnLoop(sync_loop));
   ASSERT_FALSE(FolderContainsFiles(directory_path));
 }
 
 }  // namespace