Move a bunch of child-only code from content/common to content/child

content/renderer/render_process.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 CONTENT_RENDERER_RENDER_PROCESS_H_
 #define CONTENT_RENDERER_RENDER_PROCESS_H_
 
-#include "content/common/child_process.h"
+#include "content/child/child_process.h"
 #include "skia/ext/platform_canvas.h"
 
 class TransportDIB;
 
 namespace gfx {
 class Rect;
 }
 
 namespace content {
 
@@ skipping 45 matching lines @@
     return static_cast<RenderProcess*>(ChildProcess::current());
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(RenderProcess);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_PROCESS_H_