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

webkit/blob/local_file_reader.h

Index: webkit/blob/local_file_reader.h
diff --git a/webkit/blob/local_file_reader.h b/webkit/blob/local_file_reader.h
index 23abe7b2653a9ae92dc8f91db970334337fe22d3..438faeda392a11f78be3ca9e79132b0ba2c0bfde 100644
--- a/webkit/blob/local_file_reader.h
+++ b/webkit/blob/local_file_reader.h
@@ -16,7 +16,7 @@
 #include "webkit/blob/file_reader.h"
 
 namespace base {
-class MessageLoopProxy;
+class TaskRunner;
 }
 
 namespace webkit_blob {
@@ -42,7 +42,7 @@ class BLOB_EXPORT LocalFileReader : public FileReader {
   // it does any succeeding read operations should fail with
   // ERR_UPLOAD_FILE_CHANGED error.
   // TODO(kinuko): Consider using SequencedWorkerPool.
-  LocalFileReader(base::MessageLoopProxy* file_thread_proxy,
+  LocalFileReader(base::TaskRunner* task_runner,
                   const FilePath& file_path,
                   int64 initial_offset,
                   const base::Time& expected_modification_time);
@@ -68,7 +68,7 @@ class BLOB_EXPORT LocalFileReader : public FileReader {
                int open_error,
                scoped_ptr<net::FileStream> stream);
 
-  scoped_refptr<base::MessageLoopProxy> file_thread_proxy_;
+  scoped_refptr<base::TaskRunner> task_runner_;
   scoped_ptr<net::FileStream> stream_impl_;
   const FilePath file_path_;
   const int64 initial_offset_;