Remove WindowTreeClientDelegate::GetCaptureClient() and WindowTreeClient::GetCaptureClient().

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 282 matching lines @@
   DeleteTreeAndWidget();
 }
 
 void ViewImpl::OnLostConnection(aura::WindowTreeClient* client) {
   DeleteTreeAndWidget();
 }
 
 void ViewImpl::OnPointerEventObserved(const ui::PointerEvent& event,
                                       aura::Window* target) {}
 
-aura::client::CaptureClient* ViewImpl::GetCaptureClient() {
-  // TODO: wire this up. This typically comes from WMState.
-  return nullptr;
-}
-
 aura::PropertyConverter* ViewImpl::GetPropertyConverter() {
   // TODO: wire this up.
   return nullptr;
 }
 
 views::View* ViewImpl::GetContentsView() {
   return web_view_;
 }
 
 views::Widget* ViewImpl::GetWidget() {
   return web_view_->GetWidget();
 }
 
 const views::Widget* ViewImpl::GetWidget() const {
   return web_view_->GetWidget();
 }
 
 }  // navigation