Mojo: Move mojo/public/bindings/*.h to mojo/public/cpp/bindings/*.h.

mojo/public/cpp/bindings/callback.h.pump

 $$ This is a pump file for generating file templates.  Pump is a python
 $$ script that is part of the Google Test suite of utilities.  Description
 $$ can be found here:
 $$
 $$ http://code.google.com/p/googletest/wiki/PumpManual
 $$
 
 $var MAX_ARITY = 7
 
 // Copyright 2014 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 MOJO_PUBLIC_BINDINGS_CALLBACK_H_
-#define MOJO_PUBLIC_BINDINGS_CALLBACK_H_
+#ifndef MOJO_PUBLIC_CPP_BINDINGS_CALLBACK_H_
+#define MOJO_PUBLIC_CPP_BINDINGS_CALLBACK_H_
 
 #include "mojo/public/bindings/lib/callback_internal.h"
 #include "mojo/public/bindings/lib/shared_ptr.h"
 
 namespace mojo {
 
 template <typename Sig>
 class Callback;
 
 $range ARITY 0..MAX_ARITY
@@ skipping 43 matching lines @@
     Sink sink;
   };
 
   internal::SharedPtr<Runnable> sink_;
 };
 
 ]]  $$ for ARITY
 
 }  // namespace mojo
 
-#endif  // MOJO_PUBLIC_BINDINGS_CALLBACK_H_
+#endif  // MOJO_PUBLIC_CPP_BINDINGS_CALLBACK_H_