Change webkit/{fileapi,quota} code to use TaskRunner.

webkit/fileapi/file_system_quota_client.h

Index: webkit/fileapi/file_system_quota_client.h
diff --git a/webkit/fileapi/file_system_quota_client.h b/webkit/fileapi/file_system_quota_client.h
index d5d64031af529a9da24ff735675bb1e8eea4479f..cc4cd3753cff662e1409b26e037676fefd6f3672 100644
--- a/webkit/fileapi/file_system_quota_client.h
+++ b/webkit/fileapi/file_system_quota_client.h
@@ -17,6 +17,10 @@
 #include "webkit/quota/quota_client.h"
 #include "webkit/quota/quota_task.h"
 
+namespace base {
+class SequencedTaskRunner;
+}
+
 namespace fileapi {
 
 class FileSystemContext;
@@ -30,7 +34,6 @@ class FileSystemQuotaClient : public quota::QuotaClient,
                               public quota::QuotaTaskObserver {
  public:
   FileSystemQuotaClient(
-      scoped_refptr<base::MessageLoopProxy> file_message_loop,
       FileSystemContext* file_system_context,
       bool is_incognito);
   virtual ~FileSystemQuotaClient();
@@ -83,7 +86,8 @@ class FileSystemQuotaClient : public quota::QuotaClient,
   void DidGetOriginsForHost(const TypeAndHostOrOrigin& type_and_host,
                             const std::set<GURL>& origins);
 
-  scoped_refptr<base::MessageLoopProxy> file_message_loop_;
+  base::SequencedTaskRunner* file_task_runner() const;
+
   scoped_refptr<FileSystemContext> file_system_context_;
 
   bool is_incognito_;