Move site_engagement.mojom to chrome/browser/engagement.

chrome/browser/ui/webui/engagement/site_engagement_ui.h

 // Copyright 2015 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_ENGAGEMENT_SITE_ENGAGEMENT_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_ENGAGEMENT_SITE_ENGAGEMENT_UI_H_
 
 #include "base/macros.h"
-#include "chrome/browser/ui/webui/engagement/site_engagement.mojom.h"
+#include "chrome/browser/engagement/site_engagement.mojom.h"
 #include "chrome/browser/ui/webui/mojo_web_ui_controller.h"
 
 // The UI for chrome://site-engagement/.
 class SiteEngagementUI
     : public MojoWebUIController<mojom::SiteEngagementUIHandler> {
  public:
   explicit SiteEngagementUI(content::WebUI* web_ui);
   ~SiteEngagementUI() override;
 
  private:
   // MojoWebUIController overrides:
   void BindUIHandler(
       mojo::InterfaceRequest<mojom::SiteEngagementUIHandler> request) override;
 
   std::unique_ptr<mojom::SiteEngagementUIHandler> ui_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(SiteEngagementUI);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_ENGAGEMENT_SITE_ENGAGEMENT_UI_H_