[Mojo Video Capture] Simplify media::VideoCaptureDevice::Client:Buffer to a struct

services/video_capture/BUILD.gn

 # Copyright 2016 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("//services/service_manager/public/cpp/service.gni")
 import("//services/service_manager/public/service_manifest.gni")
 import("//testing/test.gni")
 
 service("video_capture") {
   sources = [
@@ skipping 12 matching lines @@
   ]
 }
 
 service_manifest("manifest") {
   name = "video_capture"
   source = "service_manifest.json"
 }
 
 source_set("lib") {
   sources = [
-    "buffer_tracker_factory_impl.cc",
-    "buffer_tracker_factory_impl.h",
     "device_factory_media_to_mojo_adapter.cc",
     "device_factory_media_to_mojo_adapter.h",
     "device_media_to_mojo_adapter.cc",
     "device_media_to_mojo_adapter.h",
-    "mojo_shared_memory_buffer_handle.cc",
-    "mojo_shared_memory_buffer_handle.h",
-    "mojo_shared_memory_buffer_tracker.cc",
-    "mojo_shared_memory_buffer_tracker.h",
     "receiver_mojo_to_media_adapter.cc",
     "receiver_mojo_to_media_adapter.h",
   ]
 
   public_deps = [
     "//base",
     "//media",
     "//media/capture:capture",
     "//media/capture/mojo:image_capture",
     "//media/mojo/common:common",
@@ skipping 40 matching lines @@
 
   data_deps = [
     ":unittest_manifest",
   ]
 }
 
 service_manifest("unittest_manifest") {
   name = "video_capture_unittests"
   source = "test/service_unittest_manifest.json"
 }