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

content/child/thread_safe_sender.h

 // Copyright (c) 2013 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_COMMON_THREAD_SAFE_SENDER_H_
-#define CONTENT_COMMON_THREAD_SAFE_SENDER_H_
+#ifndef CONTENT_CHILD_THREAD_SAFE_SENDER_H_
+#define CONTENT_CHILD_THREAD_SAFE_SENDER_H_
 
 #include "base/memory/ref_counted.h"
 #include "ipc/ipc_sender.h"
 
 namespace base {
 class MessageLoopProxy;
 }
 
 namespace IPC {
 class SyncMessageFilter;
@@ skipping 18 matching lines @@
   virtual ~ThreadSafeSender();
 
   scoped_refptr<base::MessageLoopProxy> main_loop_;
   scoped_refptr<IPC::SyncMessageFilter> sync_filter_;
 
   DISALLOW_COPY_AND_ASSIGN(ThreadSafeSender);
 };
 
 }  // namespace content
 
-#endif  // CONTENT_COMMON_THREAD_SAFE_SENDER_H_
+#endif  // CONTENT_CHILD_THREAD_SAFE_SENDER_H_