Move core pieces of browser\renderer_host to src\content.

content/browser/renderer_host/render_widget_host.h

Index: content/browser/renderer_host/render_widget_host.h
===================================================================
--- content/browser/renderer_host/render_widget_host.h	(revision 0)
+++ content/browser/renderer_host/render_widget_host.h	(working copy)
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_H_
-#define CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_H_
+#ifndef CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_H_
+#define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_H_
 #pragma once
 
 #include <deque>
@@ -674,4 +674,4 @@
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHost);
 };
 
-#endif  // CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_H_
+#endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_H_