drive: Rename DriveFileSystemMetadata to FileSystemMetadata

chrome/browser/chromeos/drive/drive_file_system.cc

Index: chrome/browser/chromeos/drive/drive_file_system.cc
diff --git a/chrome/browser/chromeos/drive/drive_file_system.cc b/chrome/browser/chromeos/drive/drive_file_system.cc
index 366598c41ce9d217ec3e2703da4985be728f3910..085a8d67bb18605d32687ba14540c4370696ea9b 100644
--- a/chrome/browser/chromeos/drive/drive_file_system.cc
+++ b/chrome/browser/chromeos/drive/drive_file_system.cc
@@ -81,7 +81,7 @@ void RunGetEntryInfoWithFilePathCallback(
 // Callback for ResourceMetadata::GetLargestChangestamp.
 // |callback| must not be null.
 void OnGetLargestChangestamp(
-    DriveFileSystemMetadata metadata,  // Will be modified.
+    FileSystemMetadata metadata,  // Will be modified.
     const GetFilesystemMetadataCallback& callback,
     int64 largest_changestamp) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
@@ -1424,7 +1424,7 @@ void DriveFileSystem::GetMetadata(
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   DCHECK(!callback.is_null());
 
-  DriveFileSystemMetadata metadata;
+  FileSystemMetadata metadata;
   metadata.refreshing = change_list_loader_->IsRefreshing();
 
   // Metadata related to delta update.