Add content/browser/loader/ for resource loading related classes.

content/browser/loader/async_resource_handler.h

Index: content/browser/loader/async_resource_handler.h
===================================================================
--- content/browser/loader/async_resource_handler.h	(working copy)
+++ content/browser/loader/async_resource_handler.h	(working copy)
@@ -2,12 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CONTENT_BROWSER_RENDERER_HOST_ASYNC_RESOURCE_HANDLER_H_
-#define CONTENT_BROWSER_RENDERER_HOST_ASYNC_RESOURCE_HANDLER_H_
+#ifndef CONTENT_BROWSER_LOADER_ASYNC_RESOURCE_HANDLER_H_
+#define CONTENT_BROWSER_LOADER_ASYNC_RESOURCE_HANDLER_H_
 
 #include <string>
 
-#include "content/browser/renderer_host/resource_handler.h"
+#include "content/browser/loader/resource_handler.h"
 #include "googleurl/src/gurl.h"
 
 namespace net {
@@ -88,4 +88,4 @@
 
 }  // namespace content
 
-#endif  // CONTENT_BROWSER_RENDERER_HOST_ASYNC_RESOURCE_HANDLER_H_
+#endif  // CONTENT_BROWSER_LOADER_ASYNC_RESOURCE_HANDLER_H_