Move MessageLoop to base namespace.

printing/printed_document.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PRINTING_PRINTED_DOCUMENT_H_
 #define PRINTING_PRINTED_DOCUMENT_H_
 
 #include <map>
 
 #include "base/memory/ref_counted.h"
 #include "base/string16.h"
 #include "base/synchronization/lock.h"
 #include "printing/print_settings.h"
 #include "ui/gfx/native_widget_types.h"
 
-class MessageLoop;
-
 namespace base {
 class FilePath;
+class MessageLoop;
 }
 
 namespace printing {
 
 class Metafile;
 class PrintedPage;
 class PrintedPagesSource;
 class PrintingContext;
 
 // A collection of rendered pages. The settings are immutable. If the print
@@ skipping 110 matching lines @@
   // construction.
   struct Immutable {
     Immutable(const PrintSettings& settings, PrintedPagesSource* source,
               int cookie);
     ~Immutable();
 
     // Print settings used to generate this document. Immutable.
     PrintSettings settings_;
 
     // Native thread for the render source.
-    MessageLoop* source_message_loop_;
+    base::MessageLoop* source_message_loop_;
 
     // Document name. Immutable.
     string16 name_;
 
     // Cookie to uniquely identify this document. It is used to make sure that a
     // PrintedPage is correctly belonging to the PrintedDocument. Since
     // PrintedPage generation is completely asynchronous, it could be easy to
     // mess up and send the page to the wrong document. It can be viewed as a
     // simpler hash of PrintSettings since a new document is made each time the
     // print settings change.
@@ skipping 11 matching lines @@
 
   // All the immutable members.
   const Immutable immutable_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintedDocument);
 };
 
 }  // namespace printing
 
 #endif  // PRINTING_PRINTED_DOCUMENT_H_