chrome: Cleanup class/struct forward declarations

chrome/browser/ui/webui/mojo_web_ui_controller.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 CHROME_BROWSER_UI_WEBUI_MOJO_WEB_UI_CONTROLLER_H_
 #define CHROME_BROWSER_UI_WEBUI_MOJO_WEB_UI_CONTROLLER_H_
 
 #include <memory>
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/ui/webui/mojo_web_ui_handler.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/web_ui_controller.h"
 #include "mojo/public/cpp/system/core.h"
 #include "services/service_manager/public/cpp/interface_registry.h"
 
-class MojoWebUIHandler;
-
 class MojoWebUIControllerBase : public content::WebUIController {
  public:
   explicit MojoWebUIControllerBase(content::WebUI* contents);
   ~MojoWebUIControllerBase() override;
 
   // WebUIController overrides:
   void RenderFrameCreated(content::RenderFrameHost* render_frame_host) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MojoWebUIControllerBase);
@@ skipping 30 matching lines @@
   // Invoked to create the specific bindings implementation.
   virtual void BindUIHandler(mojo::InterfaceRequest<Interface> request) = 0;
 
  private:
   base::WeakPtrFactory<MojoWebUIController> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MojoWebUIController);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_MOJO_WEB_UI_CONTROLLER_H_