Make use of CreateInterfacePtrAndBind() where appropriate

mandoline/ui/desktop_ui/browser_window.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 "mandoline/ui/desktop_ui/browser_window.h"
 
 #include <stdint.h>
 
 #include <utility>
 
@@ skipping 94 matching lines @@
       manager_(manager),
       toolbar_view_(nullptr),
       progress_bar_(nullptr),
       find_bar_view_(nullptr),
       root_(nullptr),
       content_(nullptr),
       omnibox_view_(nullptr),
       find_active_(0),
       find_count_(0),
       web_view_(this) {
-  mus::mojom::WindowTreeHostClientPtr host_client;
-  host_client_binding_.Bind(GetProxy(&host_client));
-  mus::CreateWindowTreeHost(host_factory, std::move(host_client), this, &host_,
-                            nullptr, nullptr);
+  mus::CreateWindowTreeHost(host_factory,
+                            host_client_binding_.CreateInterfacePtrAndBind(),
+                            this, &host_, nullptr, nullptr);
 }
 
 void BrowserWindow::LoadURL(const GURL& url) {
   // Haven't been embedded yet, can't embed.
   // TODO(beng): remove this.
   if (!root_) {
     default_url_ = url;
     return;
   }
 
@@ skipping 322 matching lines @@
   content_bounds.set_width(DIPSToPixels(progress_bar_bounds.width()));
   content_bounds.set_height(host->bounds().height() - content_bounds.y() -
                             DIPSToPixels(10));
   content_->SetBounds(content_bounds);
 
   // The omnibox view bounds are in physical pixels.
   omnibox_view_->SetBounds(bounds_in_physical_pixels);
 }
 
 }  // namespace mandoline