Mojo: Remove utility:: namespace

mojo/public/utility/run_loop_handler.h

 // Copyright 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 MOJO_PUBLIC_UTILITY_RUN_LOOP_HANDLER_H_
 #define MOJO_PUBLIC_UTILITY_RUN_LOOP_HANDLER_H_
 
 #include "mojo/public/system/core_cpp.h"
 
 namespace mojo {
-namespace utility {
 
 // Used by RunLoop to notify when a handle is either ready or has become
 // invalid.
 class RunLoopHandler {
  public:
   virtual void OnHandleReady(const Handle& handle) = 0;
   virtual void OnHandleError(const Handle& handle, MojoResult result) = 0;
 
  protected:
   virtual ~RunLoopHandler() {}
 };
 
-}  // namespace utility
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_UTILITY_RUN_LOOP_HANDLER_H_