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

ui/aura/test/aura_test_base.h

 // 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.
 
 #ifndef UI_AURA_TEST_AURA_TEST_BASE_H_
 #define UI_AURA_TEST_AURA_TEST_BASE_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 108 matching lines @@
                            ui::mojom::MoveLoopSource source,
                            const gfx::Point& cursor_location,
                            const base::Callback<void(bool)>& on_done) override;
   void OnWmCancelMoveLoop(Window* window) override;
   void OnWmSetClientArea(
       Window* window,
       const gfx::Insets& insets,
       const std::vector<gfx::Rect>& additional_client_areas) override;
   bool IsWindowActive(aura::Window* window) override;
   void OnWmDeactivateWindow(Window* window) override;
-  client::CaptureClient* GetCaptureClient() override;
   PropertyConverter* GetPropertyConverter() override;
 
  private:
   // Only used for mus. Both are are initialized to this, but may be reset.
   WindowManagerDelegate* window_manager_delegate_;
   WindowTreeClientDelegate* window_tree_client_delegate_;
 
   bool use_mus_ = false;
   bool setup_called_ = false;
   bool teardown_called_ = false;
@@ skipping 30 matching lines @@
   void SetUp() override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AuraTestBaseMus);
 };
 
 }  // namespace test
 }  // namespace aura
 
 #endif  // UI_AURA_TEST_AURA_TEST_BASE_H_