Remove SurfaceReferenceManager interface.

services/ui/surfaces/display_compositor.cc

 // Copyright 2015 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/ui/surfaces/display_compositor.h"
 
 #include <utility>
 
 #include "base/memory/ptr_util.h"
 #include "base/threading/thread_task_runner_handle.h"
@@ skipping 16 matching lines @@
 
 namespace ui {
 
 DisplayCompositor::DisplayCompositor(
     scoped_refptr<gpu::InProcessCommandBuffer::Service> gpu_service,
     std::unique_ptr<gpu::GpuMemoryBufferManager> gpu_memory_buffer_manager,
     gpu::ImageFactory* image_factory,
     cc::mojom::DisplayCompositorRequest request,
     cc::mojom::DisplayCompositorClientPtr client)
     : manager_(cc::SurfaceManager::LifetimeType::REFERENCES),
-      reference_manager_(&manager_),
       gpu_service_(std::move(gpu_service)),
       gpu_memory_buffer_manager_(std::move(gpu_memory_buffer_manager)),
       image_factory_(image_factory),
       task_runner_(base::ThreadTaskRunnerHandle::Get()),
       client_(std::move(client)),
       binding_(this, std::move(request)) {
   manager_.AddObserver(this);
 }
 
 DisplayCompositor::~DisplayCompositor() {
@@ skipping 94 matching lines @@
   std::unique_ptr<cc::DisplayScheduler> scheduler(
       new cc::DisplayScheduler(task_runner_.get(), max_frames_pending));
 
   return base::MakeUnique<cc::Display>(
       nullptr /* bitmap_manager */, gpu_memory_buffer_manager_.get(),
       cc::RendererSettings(), frame_sink_id, begin_frame_source,
       std::move(display_output_surface), std::move(scheduler),
       base::MakeUnique<cc::TextureMailboxDeleter>(task_runner_.get()));
 }
 
-const cc::SurfaceId& DisplayCompositor::GetRootSurfaceId() const {
-  return reference_manager_->GetRootSurfaceId();
-}
-
 void DisplayCompositor::OnSurfaceCreated(const cc::SurfaceInfo& surface_info) {
   DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK_GT(surface_info.device_scale_factor(), 0.0f);
 
   if (client_)
     client_->OnSurfaceCreated(surface_info);
 }
 
 void DisplayCompositor::OnSurfaceDamaged(const cc::SurfaceId& surface_id,
                                          bool* changed) {}
 
 }  // namespace ui