drive: Rename FileCache methods in a blocking pool centric manner

chrome/browser/chromeos/drive/file_system/remove_operation.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/file_system/remove_operation.h"
 
 #include "chrome/browser/chromeos/drive/drive.pb.h"
 #include "chrome/browser/chromeos/drive/file_cache.h"
 #include "chrome/browser/chromeos/drive/file_system/operation_observer.h"
 #include "chrome/browser/chromeos/drive/file_system_util.h"
@@ skipping 76 matching lines @@
   if (error != FILE_ERROR_OK) {
     callback.Run(error);
     return;
   }
 
   metadata_->RemoveEntry(resource_id,
                          base::Bind(&RemoveOperation::NotifyDirectoryChanged,
                                     weak_ptr_factory_.GetWeakPtr(),
                                     callback));
 
-  cache_->Remove(resource_id, base::Bind(&EmptyFileOperationCallback));
+  cache_->RemoveOnUIThread(resource_id,
+                           base::Bind(&EmptyFileOperationCallback));
 }
 
 void RemoveOperation::NotifyDirectoryChanged(
     const FileOperationCallback& callback,
     FileError error,
     const base::FilePath& directory_path) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   DCHECK(!callback.is_null());
 
   if (error == FILE_ERROR_OK)
     observer_->OnDirectoryChangedByOperation(directory_path);
 
   callback.Run(error);
 }
 
 }  // namespace file_system
 }  // namespace drive