cc: Remove BeginFrameSourcesConstructor.

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 256 matching lines @@
     "output/software_output_device.h",
     "output/software_renderer.cc",
     "output/software_renderer.h",
     "output/static_geometry_binding.cc",
     "output/static_geometry_binding.h",
     "output/swap_promise.h",
     "output/texture_mailbox_deleter.cc",
     "output/texture_mailbox_deleter.h",
     "output/viewport_selection_bound.cc",
     "output/viewport_selection_bound.h",
-    "output/vsync_parameter_observer.h",
     "playback/clip_display_item.cc",
     "playback/clip_display_item.h",
     "playback/clip_path_display_item.cc",
     "playback/clip_path_display_item.h",
     "playback/compositing_display_item.cc",
     "playback/compositing_display_item.h",
     "playback/display_item.cc",
     "playback/display_item.h",
     "playback/display_item_list.cc",
     "playback/display_item_list.h",
@@ skipping 595 matching lines @@
     "//ui/gfx/geometry",
     "//ui/gl",
   ]
 
   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.