drive: Stop returning FilePath from GetResourceEntryById

chrome/browser/chromeos/drive/remove_stale_cache_files_unittest.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 <string>
 
 #include "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
@@ skipping 64 matching lines @@
   // Create a stale cache file.
   EXPECT_EQ(FILE_ERROR_OK,
             cache_->Store(resource_id, md5, dummy_file,
                           FileCache::FILE_OPERATION_COPY));
 
   // Verify that the cache entry exists.
   FileCacheEntry cache_entry;
   EXPECT_TRUE(cache_->GetCacheEntry(resource_id, md5, &cache_entry));
 
   ResourceEntry entry;
-  EXPECT_EQ(
-      FILE_ERROR_NOT_FOUND,
-      resource_metadata_->GetResourceEntryById(resource_id, NULL, &entry));
+  EXPECT_EQ(FILE_ERROR_NOT_FOUND,
+            resource_metadata_->GetResourceEntryById(resource_id, &entry));
 
   // Remove stale cache files.
   RemoveStaleCacheFiles(cache_.get(), resource_metadata_.get());
 
   // Verify that the cache entry is deleted.
   EXPECT_FALSE(cache_->GetCacheEntry(resource_id, md5, &cache_entry));
 }
 
 }  // namespace internal
 }  // namespace drive