Use base::Callback in Quota related code.

webkit/fileapi/file_system_operation.h

Index: webkit/fileapi/file_system_operation.h
diff --git a/webkit/fileapi/file_system_operation.h b/webkit/fileapi/file_system_operation.h
index b38633a99fe4fe7b8bb8549f6c4510692253fa05..0435a0ae09a8730cb0a79a75528ff59060d65029 100644
--- a/webkit/fileapi/file_system_operation.h
+++ b/webkit/fileapi/file_system_operation.h
@@ -111,7 +111,7 @@ class FileSystemOperation {
 
   void GetUsageAndQuotaThenCallback(
       const GURL& origin_url,
-      quota::QuotaManager::GetUsageAndQuotaCallback* callback);
+      const quota::QuotaManager::GetUsageAndQuotaCallback& callback);
 
   void DelayedCreateFileForQuota(quota::QuotaStatusCode status,
                                  int64 usage, int64 quota);
@@ -240,6 +240,7 @@ class FileSystemOperation {
 
   FileSystemOperationContext file_system_operation_context_;
 
+  base::WeakPtrFactory<FileSystemOperation> weak_factory_;
   base::ScopedCallbackFactory<FileSystemOperation> callback_factory_;
 
   scoped_ptr<ScopedQuotaUtilHelper> quota_util_helper_;