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

ui/aura/mus/window_tree_client.cc

 // 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.
 
 #include "ui/aura/mus/window_tree_client.h"
 
 #include <stddef.h>
 
 #include <string>
 #include <utility>
@@ skipping 216 matching lines @@
   DCHECK(window_manager_delegate_);
 
   ui::mojom::WindowManagerWindowTreeFactoryPtr factory;
   connector_->BindInterface(ui::mojom::kServiceName, &factory);
   ui::mojom::WindowTreePtr window_tree;
   factory->CreateWindowTree(MakeRequest(&window_tree),
                             binding_.CreateInterfacePtrAndBind());
   SetWindowTree(std::move(window_tree));
 }
 
-client::CaptureClient* WindowTreeClient::GetCaptureClient() {
-  return delegate_->GetCaptureClient();
-}
-
 void WindowTreeClient::SetCanFocus(Window* window, bool can_focus) {
   DCHECK(tree_);
   DCHECK(window);
   tree_->SetCanFocus(WindowMus::Get(window)->server_id(), can_focus);
 }
 
 void WindowTreeClient::SetPredefinedCursor(WindowMus* window,
                                            ui::mojom::Cursor old_cursor,
                                            ui::mojom::Cursor new_cursor) {
   DCHECK(tree_);
@@ skipping 1571 matching lines @@
   return ScheduleInFlightChange(base::MakeUnique<InFlightCaptureChange>(
       this, capture_synchronizer_.get(), window));
 }
 
 uint32_t WindowTreeClient::CreateChangeIdForFocus(WindowMus* window) {
   return ScheduleInFlightChange(base::MakeUnique<InFlightFocusChange>(
       this, focus_synchronizer_.get(), window));
 }
 
 }  // namespace aura