Put code in //services/window_manager in namespace window_manager

services/window_manager/window_manager_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_WINDOW_MANAGER_WINDOW_MANAGER_DELEGATE_H_
 #define SERVICES_WINDOW_MANAGER_WINDOW_MANAGER_DELEGATE_H_
 
 #include "mojo/public/cpp/bindings/string.h"
 #include "mojo/public/interfaces/application/service_provider.mojom.h"
 
-namespace mojo {
+namespace window_manager {
 
 class WindowManagerDelegate {
  public:
   // See WindowManager::Embed() for details.
-  virtual void Embed(const String& url,
-                     InterfaceRequest<ServiceProvider> service_provider) = 0;
+  virtual void Embed(
+      const mojo::String& url,
+      mojo::InterfaceRequest<mojo::ServiceProvider> service_provider) = 0;
 
  protected:
   virtual ~WindowManagerDelegate() {}
 };
 
 }  // namespace mojo
 
 #endif  // SERVICES_WINDOW_MANAGER_WINDOW_MANAGER_DELEGATE_H_