Don't use base::MessageLoop::{Quit,QuitClosure} in chrome/

chrome/browser/sync_file_system/local/local_file_sync_context_unittest.cc

 // Copyright 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/sync_file_system/local/local_file_sync_context.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 114 matching lines @@
                          SyncStatusCode status,
                          const LocalFileSyncInfo& sync_file_info,
                          storage::ScopedFile snapshot) {
     ASSERT_TRUE(ui_task_runner_->RunsTasksOnCurrentThread());
     has_inflight_prepare_for_sync_ = false;
     status_ = status;
     *metadata_out = sync_file_info.metadata;
     *changes_out = sync_file_info.changes;
     if (snapshot_out)
       *snapshot_out = snapshot.Pass();
-    base::MessageLoop::current()->Quit();
+    base::MessageLoop::current()->QuitWhenIdle();
   }
 
   SyncStatusCode ApplyRemoteChange(FileSystemContext* file_system_context,
                                    const FileChange& change,
                                    const base::FilePath& local_path,
                                    const FileSystemURL& url,
                                    SyncFileType expected_file_type) {
     SCOPED_TRACE(testing::Message() << "ApplyChange for " <<
                  url.DebugString());
 
@@ skipping 16 matching lines @@
     return status_;
   }
 
   void DidApplyRemoteChange(FileSystemContext* file_system_context,
                             const FileSystemURL& url,
                             SyncStatusCode status) {
     status_ = status;
     sync_context_->FinalizeExclusiveSync(
         file_system_context, url,
         status == SYNC_STATUS_OK /* clear_local_changes */,
-        base::MessageLoop::QuitClosure());
+        base::MessageLoop::QuitWhenIdleClosure());
   }
 
   void StartModifyFileOnIOThread(CannedSyncableFileSystem* file_system,
                                  const FileSystemURL& url) {
     ASSERT_TRUE(file_system != nullptr);
     if (!io_task_runner_->RunsTasksOnCurrentThread()) {
       async_modify_finished_ = false;
       ASSERT_TRUE(ui_task_runner_->RunsTasksOnCurrentThread());
       io_task_runner_->PostTask(
           FROM_HERE,
@@ skipping 767 matching lines @@
 
   // Make sure kDir and kFile are created by ApplyRemoteChange.
   EXPECT_EQ(base::File::FILE_OK, file_system.FileExists(kFile));
   EXPECT_EQ(base::File::FILE_OK, file_system.DirectoryExists(kDir));
 
   sync_context_->ShutdownOnUIThread();
   file_system.TearDown();
 }
 
 }  // namespace sync_file_system