Use mus::MojoGpuMemoryBufferManager in mus::GpuService.

components/mus/gles2/BUILD.gn

 # 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.
 
 import("//build/config/ui.gni")
 
 source_set("gles2") {
   visibility = [
     "//components/mus:*",
     "//components/mus/ws:*",
@@ skipping 50 matching lines @@
       "ozone_gpu_memory_buffer.cc",
       "ozone_gpu_memory_buffer.h",
     ]
   }
 
   include_dirs = [ "../.." ]
 }
 
 source_set("lib") {
   sources = [
-    "gpu_memory_buffer_impl.cc",
-    "gpu_memory_buffer_impl.h",
-    "mojo_buffer_backing.cc",
-    "mojo_buffer_backing.h",
-    "mojo_gpu_memory_buffer.cc",
-    "mojo_gpu_memory_buffer.h",
-    "mojo_gpu_memory_buffer_manager.cc",
-    "mojo_gpu_memory_buffer_manager.h",
     "raster_thread_helper.cc",
     "raster_thread_helper.h",
   ]
 
   deps = [
     "//base",
     "//cc",
     "//components/mus/public/interfaces",
     "//gpu/command_buffer/client",
     "//gpu/command_buffer/common",
     "//gpu/config:config",
     "//mojo/public/cpp/bindings",
     "//mojo/public/cpp/system",
     "//ui/gfx",
     "//ui/gfx/geometry",
   ]
 
   include_dirs = [ "../.." ]
 }