cc: Remove code for drawing checkerboard quads, it's not used.

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 303 matching lines @@
     "playback/picture_pile.h",
     "playback/picture_pile_impl.cc",
     "playback/picture_pile_impl.h",
     "playback/pixel_ref_map.cc",
     "playback/pixel_ref_map.h",
     "playback/raster_source.h",
     "playback/raster_source_helper.cc",
     "playback/raster_source_helper.h",
     "playback/transform_display_item.cc",
     "playback/transform_display_item.h",
-    "quads/checkerboard_draw_quad.cc",
-    "quads/checkerboard_draw_quad.h",
     "quads/content_draw_quad_base.cc",
     "quads/content_draw_quad_base.h",
     "quads/debug_border_draw_quad.cc",
     "quads/debug_border_draw_quad.h",
     "quads/draw_polygon.cc",
     "quads/draw_polygon.h",
     "quads/draw_quad.cc",
     "quads/draw_quad.h",
     "quads/io_surface_draw_quad.cc",
     "quads/io_surface_draw_quad.h",
@@ skipping 587 matching lines @@
     "//ui/gl",
     "//ui/gl:test_support",
   ]
 
   if (is_android) {
     isolate_file = "cc_perftests.isolate"
   }
 }
 # When adding support for isolates, please have a look at run-time dependencies
 # in the cc_unittests_run target in cc_tests.gyp.