Put code in //services/js in namespace js

services/js/js_app_runner_delegate.h

 // 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 SERVICES_JS_JS_APP_RUNNER_DELEGATE_H_
 #define SERVICES_JS_JS_APP_RUNNER_DELEGATE_H_
 
 #include "gin/modules/module_runner_delegate.h"
 #include "gin/shell_runner.h"
 #include "gin/try_catch.h"
 
-namespace mojo {
 namespace js {
 
 class JSAppRunnerDelegate : public gin::ModuleRunnerDelegate {
  public:
   JSAppRunnerDelegate();
   ~JSAppRunnerDelegate() override;
 
   // From ModuleRunnerDelegate:
   void UnhandledException(gin::ShellRunner* runner,
                           gin::TryCatch& try_catch) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(JSAppRunnerDelegate);
 };
 
 }  // namespace js
-}  // namespace mojo
 
 #endif  // SERVICES_JS_JS_APP_RUNNER_DELEGATE_H_