drive: Rename FileCache methods in a blocking pool centric manner

chrome/browser/chromeos/drive/debug_info_collector.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/chromeos/drive/debug_info_collector.h"
 
 #include "base/callback.h"
 #include "base/logging.h"
 #include "content/public/browser/browser_thread.h"
 
@@ skipping 12 matching lines @@
 DebugInfoCollector::~DebugInfoCollector() {
 }
 
 void DebugInfoCollector::IterateFileCache(
     const CacheIterateCallback& iteration_callback,
     const base::Closure& completion_callback) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   DCHECK(!iteration_callback.is_null());
   DCHECK(!completion_callback.is_null());
 
-  file_cache_->Iterate(iteration_callback, completion_callback);
+  file_cache_->IterateOnUIThread(iteration_callback, completion_callback);
 }
 
 void DebugInfoCollector::GetMetadata(
     const GetFilesystemMetadataCallback& callback) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   DCHECK(!callback.is_null());
 
   // Currently, this is just a proxy to the DriveFileSystem.
   // TODO(hidehiko): Move the implementation to here to simplify the
   // DriveFileSystem's implementation. crbug.com/237088
   file_system_->GetMetadata(callback);
 }
 
 }  // namespace drive