Notify CloseFile from Pepper to FileSystem.

chrome/browser/chromeos/gdata/gdata_file_system_proxy.cc

Index: chrome/browser/chromeos/gdata/gdata_file_system_proxy.cc
diff --git a/chrome/browser/chromeos/gdata/gdata_file_system_proxy.cc b/chrome/browser/chromeos/gdata/gdata_file_system_proxy.cc
index 376f96a629d356da92f638b3da8c639a76709d64..725b6631f2badc8d67e2673c4d8a92b9068edce0 100644
--- a/chrome/browser/chromeos/gdata/gdata_file_system_proxy.cc
+++ b/chrome/browser/chromeos/gdata/gdata_file_system_proxy.cc
@@ -387,6 +387,12 @@ void GDataFileSystemProxy::OpenFile(
                               GetDownloadDataCallback());
 }
 
+void GDataFileSystemProxy::NotifyCloseFile(const FileSystemURL& url) {
+  // TODO(kinaba,zelidrag): crbug.com/132236.
+  // Once OpenFile() for writing is implemented, we also need to implement the
+  // corresponding NotifyCloseFile for committing dirty cache.
+}
+
 void GDataFileSystemProxy::CreateSnapshotFile(
     const FileSystemURL& file_url,
     const FileSystemOperationInterface::SnapshotFileCallback& callback) {