drive: Change FileCache::GetCacheEntry's return type to FileError

chrome/browser/chromeos/drive/file_system/copy_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/copy_operation.h"
 
 #include <string>
 
 #include "base/file_util.h"
 #include "base/task_runner_util.h"
@@ skipping 100 matching lines @@
       break;
     case FILE_ERROR_NOT_FOUND:
       break;
     default:
       return error;
   }
 
   // If the cache file is not present and the entry exists on the server,
   // server side copy should be used.
   FileCacheEntry cache_entry;
-  cache->GetCacheEntry(params->src_entry.local_id(), &cache_entry);
+  error = cache->GetCacheEntry(params->src_entry.local_id(), &cache_entry);
+  if (error != FILE_ERROR_OK && error != FILE_ERROR_NOT_FOUND)
+    return error;
   if (!cache_entry.is_present() && !params->src_entry.resource_id().empty()) {
     *should_copy_on_server = true;
     return FILE_ERROR_OK;
   }
 
   // Copy locally.
   ResourceEntry entry;
   const int64 now = base::Time::Now().ToInternalValue();
   entry.set_title(params->dest_file_path.BaseName().AsUTF8Unsafe());
   entry.set_parent_local_id(params->parent_entry.local_id());
@@ skipping 448 matching lines @@
 
   if (error == FILE_ERROR_OK) {
     observer_->OnDirectoryChangedByOperation(remote_dest_path.DirName());
     observer_->OnEntryUpdatedByOperation(*local_id);
   }
   callback.Run(error);
 }
 
 }  // namespace file_system
 }  // namespace drive