aura: Some change to how the client-lib is set up.

services/navigation/view_impl.cc

 // Copyright 2016 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 "services/navigation/view_impl.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/interstitial_page.h"
@@ skipping 103 matching lines @@
                    : content::ReloadType::NORMAL,
       true);
 }
 
 void ViewImpl::Stop() {
   web_view_->GetWebContents()->Stop();
 }
 
 void ViewImpl::GetWindowTreeClient(ui::mojom::WindowTreeClientRequest request) {
   window_tree_client_ = base::MakeUnique<aura::WindowTreeClient>(
-      connector_.get(), this, nullptr, std::move(request));
+      connector_.get(), nullptr, this, nullptr, std::move(request));
 }
 
 void ViewImpl::ShowInterstitial(const std::string& html) {
   content::InterstitialPage* interstitial =
       content::InterstitialPage::Create(web_view_->GetWebContents(),
                                         false,
                                         GURL(),
                                         new InterstitialPageDelegate(html));
   interstitial->Show();
 }
@@ skipping 181 matching lines @@
 
 views::Widget* ViewImpl::GetWidget() {
   return web_view_->GetWidget();
 }
 
 const views::Widget* ViewImpl::GetWidget() const {
   return web_view_->GetWidget();
 }
 
 }  // navigation