Change MojoWebUIController to use mojo::StrongBindingSet.

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

Index: chrome/browser/ui/webui/engagement/site_engagement_ui.h
diff --git a/chrome/browser/ui/webui/engagement/site_engagement_ui.h b/chrome/browser/ui/webui/engagement/site_engagement_ui.h
index 678362a06c0668ddbda2289358b9af9b2b934641..67a6cf77b1f04fe7e8e1437b9d4cd3d7ef0c7f9d 100644
--- a/chrome/browser/ui/webui/engagement/site_engagement_ui.h
+++ b/chrome/browser/ui/webui/engagement/site_engagement_ui.h
@@ -7,19 +7,21 @@
 
 #include "base/macros.h"
 #include "chrome/browser/ui/webui/engagement/site_engagement.mojom.h"
+#include "chrome/browser/ui/webui/engagement/site_engagement_ui_handler.h"
 #include "chrome/browser/ui/webui/mojo_web_ui_controller.h"
 
+namespace content {
+class WebUI;
+}
+
 // The UI for chrome://site-engagement/.
-class SiteEngagementUI : public MojoWebUIController<SiteEngagementUIHandler> {
+class SiteEngagementUI
+    : public MojoWebUIController<SiteEngagementUIHandlerImpl> {
  public:
   explicit SiteEngagementUI(content::WebUI* web_ui);
   ~SiteEngagementUI() override;
 
  private:
-  // MojoWebUIController overrides:
-  void BindUIHandler(
-      mojo::InterfaceRequest<SiteEngagementUIHandler> request) override;
-
   DISALLOW_COPY_AND_ASSIGN(SiteEngagementUI);
 };