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

content/child/child_thread.h

Index: content/child/child_thread.h
diff --git a/content/common/child_thread.h b/content/child/child_thread.h
similarity index 98%
rename from content/common/child_thread.h
rename to content/child/child_thread.h
index 4df92037a01f558462d6b48f1568afb18d76a3e5..470cb5a042250f0ca9b2602062bb53da29d40db7 100644
--- a/content/common/child_thread.h
+++ b/content/child/child_thread.h
@@ -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 CONTENT_COMMON_CHILD_THREAD_H_
-#define CONTENT_COMMON_CHILD_THREAD_H_
+#ifndef CONTENT_CHILD_CHILD_THREAD_H_
+#define CONTENT_CHILD_CHILD_THREAD_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
@@ -190,4 +190,4 @@ class CONTENT_EXPORT ChildThread : public IPC::Listener, public IPC::Sender {
 
 }  // namespace content
 
-#endif  // CONTENT_COMMON_CHILD_THREAD_H_
+#endif  // CONTENT_CHILD_CHILD_THREAD_H_