drive: Stop returning FilePath from GetResourceEntryById

chrome/browser/chromeos/drive/remove_stale_cache_files.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/remove_stale_cache_files.h"
 
 #include <string>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "chrome/browser/chromeos/drive/drive.pb.h"
 #include "chrome/browser/chromeos/drive/file_cache.h"
 #include "chrome/browser/chromeos/drive/resource_metadata.h"
 
 namespace drive {
 namespace internal {
 
 namespace {
 
 // Collects resource IDs of stale cache files.
 void CollectStaleCacheFiles(
     ResourceMetadata* resource_metadata,
     std::vector<std::string>* out_resource_ids_to_be_removed,
     const std::string& resource_id,
     const FileCacheEntry& cache_entry) {
   ResourceEntry entry;
   FileError error = resource_metadata->GetResourceEntryById(
-      resource_id, NULL, &entry);
+      resource_id, &entry);
 
   // The entry is not found or the MD5 does not match.
   if (error != FILE_ERROR_OK ||
       cache_entry.md5() != entry.file_specific_info().file_md5())
     out_resource_ids_to_be_removed->push_back(resource_id);
 }
 
 }  // namespace
 
 void RemoveStaleCacheFiles(FileCache* cache,
                            ResourceMetadata* resource_metadata) {
   std::vector<std::string> resource_ids_to_be_removed;
   cache->Iterate(base::Bind(&CollectStaleCacheFiles,
                             resource_metadata,
                             &resource_ids_to_be_removed));
 
   for (size_t i = 0; i < resource_ids_to_be_removed.size(); ++i) {
     const std::string& resource_id = resource_ids_to_be_removed[i];
     FileError error = cache->Remove(resource_id);
     LOG_IF(WARNING, error != FILE_ERROR_OK)
         << "Failed to remove a stale cache file. resource_id: " << resource_id;
   }
 }
 
 }  // namespace internal
 }  // namespace drive