Change MojoWebUIController to use mojo::StrongBindingSet.

chrome/browser/ui/webui/engagement/site_engagement_ui_handler.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_HANDLER_H_
+#define CHROME_BROWSER_UI_WEBUI_ENGAGEMENT_SITE_ENGAGEMENT_UI_HANDLER_H_
+
+#include "base/macros.h"
+#include "chrome/browser/ui/webui/engagement/site_engagement.mojom.h"
+
+namespace content {
+class WebUI;
+}
+
+class Profile;
+
+// Implementation of SiteEngagementUIHandler that gets information from the
+// SiteEngagementService to provide data for the WebUI.
+class SiteEngagementUIHandlerImpl : public SiteEngagementUIHandler {
+ public:
+  explicit SiteEngagementUIHandlerImpl(content::WebUI* web_ui);
+  ~SiteEngagementUIHandlerImpl() override;
+
+  // SiteEngagementUIHandler overrides:
+  void GetSiteEngagementInfo(
+      const GetSiteEngagementInfoCallback& callback) override;
+
+ private:
+  // The Profile* for the content::WebUI handed to us in our constructor.
+  Profile* profile_;
+
+  DISALLOW_COPY_AND_ASSIGN(SiteEngagementUIHandlerImpl);
+};
+
+#endif  // CHROME_BROWSER_UI_WEBUI_ENGAGEMENT_SITE_ENGAGEMENT_UI_HANDLER_H_