gdata: Remove OnDirectoryChanged from MockGDataSyncClient

chrome/browser/chromeos/gdata/mock_gdata_sync_client.h

Index: chrome/browser/chromeos/gdata/mock_gdata_sync_client.h
diff --git a/chrome/browser/chromeos/gdata/mock_gdata_sync_client.h b/chrome/browser/chromeos/gdata/mock_gdata_sync_client.h
index b331b34cde96e9213b8bd82a993c2586d6375206..a1bff95ef3b21e342c351fc5e1000238ecfd606e 100644
--- a/chrome/browser/chromeos/gdata/mock_gdata_sync_client.h
+++ b/chrome/browser/chromeos/gdata/mock_gdata_sync_client.h
@@ -32,7 +32,7 @@ class MockGDataSyncClient : public GDataSyncClientInterface,
                                   const std::string& md5));
   MOCK_METHOD2(OnFileUnpinned, void(const std::string& resource_id,
                                     const std::string& md5));
-  MOCK_METHOD1(OnDirectoryChanged, void(const FilePath& directory_path));
+  // GDataSyncClient is not interested in OnDirectoryChanged.
 };
 
 }  // namespace gdata