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

ui/aura/test/aura_test_base.cc

 // Copyright (c) 2012 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/test/aura_test_base.h"
 
 #include "ui/aura/client/window_parenting_client.h"
 #include "ui/aura/mus/property_utils.h"
 #include "ui/aura/mus/window_tree_client.h"
 #include "ui/aura/mus/window_tree_host_mus.h"
@@ skipping 208 matching lines @@
 
 void AuraTestBase::OnWmSetClientArea(
     Window* window,
     const gfx::Insets& insets,
     const std::vector<gfx::Rect>& additional_client_areas) {}
 
 bool AuraTestBase::IsWindowActive(aura::Window* window) { return false; }
 
 void AuraTestBase::OnWmDeactivateWindow(Window* window) {}
 
-client::CaptureClient* AuraTestBase::GetCaptureClient() {
-  return helper_->capture_client();
-}
-
 PropertyConverter* AuraTestBase::GetPropertyConverter() {
   return &property_converter_;
 }
 
 AuraTestBaseWithType::AuraTestBaseWithType() {}
 
 AuraTestBaseWithType::~AuraTestBaseWithType() {
   DCHECK(setup_called_);
 }
 
 void AuraTestBaseWithType::SetUp() {
   DCHECK(!setup_called_);
   setup_called_ = true;
   ConfigureBackend(GetParam());
   AuraTestBase::SetUp();
 }
 
 }  // namespace test
 }  // namespace aura