Reduce boilerplate needed to configure mojo::Binding

mash/shelf/shelf_view.cc

 // 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.
 
 #include "mash/shelf/shelf_view.h"
 
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "mojo/common/common_type_converters.h"
 #include "mojo/shell/public/cpp/application_impl.h"
 #include "ui/gfx/canvas.h"
 #include "ui/views/controls/button/label_button.h"
 #include "ui/views/layout/box_layout.h"
 
 namespace mash {
 namespace shelf {
 
 ShelfView::ShelfView(mojo::ApplicationImpl* app) : binding_(this) {
   app->ConnectToService("mojo:desktop_wm", &user_window_controller_);
 
-  mash::wm::mojom::UserWindowObserverPtr observer;
-  mojo::InterfaceRequest<mash::wm::mojom::UserWindowObserver> request =
-      mojo::GetProxy(&observer);
-  user_window_controller_->AddUserWindowObserver(std::move(observer));
-  binding_.Bind(std::move(request));
+  user_window_controller_->AddUserWindowObserver(
+      binding_.CreateInterfacePtrAndBind());
 
   SetLayoutManager(
       new views::BoxLayout(views::BoxLayout::kHorizontal, 0, 0, 0));
 }
 
 ShelfView::~ShelfView() {}
 
 size_t ShelfView::GetButtonIndexById(uint32_t window_id) const {
   for (size_t i = 0; i < open_window_buttons_.size(); ++i)
     if (static_cast<uint32_t>(open_window_buttons_[i]->tag()) == window_id)
@@ skipping 54 matching lines @@
     return;
 
   open_window_buttons_[index]->SetText(window_title.To<base::string16>());
   open_window_buttons_[index]->SetMinSize(gfx::Size());
   Layout();
   SchedulePaint();
 }
 
 }  // namespace shelf
 }  // namespace mash