gdata: Convert public synchronous functions in GDataFileSystem to asynchronous.

chrome/browser/chromeos/gdata/mock_gdata_file_system.h

Index: chrome/browser/chromeos/gdata/mock_gdata_file_system.h
diff --git a/chrome/browser/chromeos/gdata/mock_gdata_file_system.h b/chrome/browser/chromeos/gdata/mock_gdata_file_system.h
index f0a2a92e3017919765e499d955bc8fc2dd7ea192..20acce37bfb1a19d880b26ab667665cd298da6d8 100644
--- a/chrome/browser/chromeos/gdata/mock_gdata_file_system.h
+++ b/chrome/browser/chromeos/gdata/mock_gdata_file_system.h
@@ -80,8 +80,6 @@ class MockGDataFileSystem : public GDataFileSystemInterface {
                     const ReadDirectoryCallback& callback));
   MOCK_METHOD1(RequestDirectoryRefresh,
                void(const FilePath& file_path));
-  MOCK_METHOD2(GetFileInfoByPath, bool(const FilePath& file_path,
-                                       GDataFileProperties* properties));
   MOCK_CONST_METHOD1(IsUnderGDataCacheDirectory, bool(const FilePath& path));
   MOCK_CONST_METHOD1(GetCacheDirectoryPath, FilePath(
       GDataCache::CacheSubDirectoryType));