Change MojoWebUIController to use mojo::StrongBindingSet.

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 <string>
+#include <utility>
 
-#include "base/memory/scoped_ptr.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 "content/public/common/service_registry.h"
-#include "mojo/public/cpp/system/core.h"
+#include "mojo/common/strong_binding_set.h"
 
 class MojoWebUIHandler;
 
-namespace content {
-class WebUIDataSource;
-}
-
 class MojoWebUIControllerBase : public content::WebUIController {
  public:
   explicit MojoWebUIControllerBase(content::WebUI* contents);
   ~MojoWebUIControllerBase() override;
 
   // WebUIController overrides:
   void RenderViewCreated(content::RenderViewHost* render_view_host) override;
 
  private:
-  // Bindings files are registered here.
-  content::WebUIDataSource* mojo_data_source_;
-
   DISALLOW_COPY_AND_ASSIGN(MojoWebUIControllerBase);
 };
 
 // MojoWebUIController is intended for web ui pages that use mojo. It is
-// expected that subclasses will do two things:
-// . In the constructor invoke AddMojoResourcePath() to register the bindings
-//   files, eg:
-//     AddMojoResourcePath("chrome/browser/ui/webui/omnibox/omnibox.mojom",
-//                         IDR_OMNIBOX_MOJO_JS);
-// . Override BindUIHandler() to create and bind the implementation of the
-//   bindings.
-template <typename Interface>
+// expected that |Impl| is constructible from a content::WebUI. A subclass
+// should, in its constructor, invoke AddMojoResources() on its
+// content::WebUIDataSource to register the bindings files.
+template <typename Impl>
 class MojoWebUIController : public MojoWebUIControllerBase {
  public:
   explicit MojoWebUIController(content::WebUI* contents)
       : MojoWebUIControllerBase(contents), weak_factory_(this) {}
-  ~MojoWebUIController() override {}
+  ~MojoWebUIController() override = default;
+
   void RenderViewCreated(content::RenderViewHost* render_view_host) override {
     MojoWebUIControllerBase::RenderViewCreated(render_view_host);
-    render_view_host->GetMainFrame()->GetServiceRegistry()->
-        AddService<Interface>(
-            base::Bind(&MojoWebUIController::BindUIHandler,
-                       weak_factory_.GetWeakPtr()));
+    render_view_host->GetMainFrame()->GetServiceRegistry()->AddService(
+        base::Bind(&MojoWebUIController::BindUIHandler,
+                   weak_factory_.GetWeakPtr()));
   }
 
- protected:
+ private:
   // Invoked to create the specific bindings implementation.
-  virtual void BindUIHandler(mojo::InterfaceRequest<Interface> request) = 0;
+  void BindUIHandler(
+      mojo::InterfaceRequest<typename mojo::StrongBindingSet<Impl>::Interface>
+          request) {
+    services_.EmplaceService(std::move(request), web_ui());
+  }
 
- private:
+  mojo::StrongBindingSet<Impl> services_;
+
   base::WeakPtrFactory<MojoWebUIController> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MojoWebUIController);
 };
-
 #endif  // CHROME_BROWSER_UI_WEBUI_MOJO_WEB_UI_CONTROLLER_H_