drive: Rename FileCache methods in a blocking pool centric manner

chrome/browser/chromeos/drive/drive_system_service.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 "chrome/browser/chromeos/drive/drive_system_service.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 200 matching lines @@
 
   return true;
 }
 
 void DriveSystemService::ClearCacheAndRemountFileSystem(
     const base::Callback<void(bool)>& callback) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   DCHECK(!callback.is_null());
 
   RemoveDriveMountPoint();
-  cache_->ClearAll(base::Bind(
+  cache_->ClearAllOnUIThread(base::Bind(
       &DriveSystemService::ReinitializeResourceMetadataAfterClearCache,
       weak_ptr_factory_.GetWeakPtr(),
       callback));
 }
 
 void DriveSystemService::ReinitializeResourceMetadataAfterClearCache(
     const base::Callback<void(bool)>& callback,
     bool success) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   DCHECK(!callback.is_null());
@@ skipping 207 matching lines @@
   if (factory_for_test_.is_null())
     service = new DriveSystemService(profile, NULL, base::FilePath(), NULL);
   else
     service = factory_for_test_.Run(profile);
 
   service->Initialize();
   return service;
 }
 
 }  // namespace drive