Remove unused transparency display items.

cc/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("//testing/test.gni")
 
 component("cc") {
   sources = [
     "animation/animation.cc",
     "animation/animation.h",
@@ skipping 457 matching lines @@
     "resources/tiling_set_eviction_queue.cc",
     "resources/tiling_set_eviction_queue.h",
     "resources/tiling_set_raster_queue_all.cc",
     "resources/tiling_set_raster_queue_all.h",
     "resources/tiling_set_raster_queue_required.cc",
     "resources/tiling_set_raster_queue_required.h",
     "resources/transferable_resource.cc",
     "resources/transferable_resource.h",
     "resources/transform_display_item.cc",
     "resources/transform_display_item.h",
-    "resources/transparency_display_item.cc",
-    "resources/transparency_display_item.h",
     "resources/ui_resource_bitmap.cc",
     "resources/ui_resource_bitmap.h",
     "resources/ui_resource_client.h",
     "resources/ui_resource_request.cc",
     "resources/ui_resource_request.h",
     "resources/video_resource_updater.cc",
     "resources/video_resource_updater.h",
     "resources/zero_copy_tile_task_worker_pool.cc",
     "resources/zero_copy_tile_task_worker_pool.h",
     "scheduler/begin_frame_source.cc",
@@ skipping 430 matching lines @@
     "//media",
     "//skia",
     "//testing/gmock",
     "//testing/gtest",
     "//testing/perf",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/gl",
   ]
 }