cc: Remove AsValue virtual from DisplayItem.

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("//build/config/ui.gni")
 import("//cc/cc.gni")
 
 cc_component("cc") {
   sources = [
     "debug/benchmark_instrumentation.cc",
@@ skipping 26 matching lines @@
     "debug/picture_debug_util.h",
     "debug/rasterize_and_record_benchmark.cc",
     "debug/rasterize_and_record_benchmark.h",
     "debug/rasterize_and_record_benchmark_impl.cc",
     "debug/rasterize_and_record_benchmark_impl.h",
     "debug/rendering_stats.cc",
     "debug/rendering_stats.h",
     "debug/rendering_stats_instrumentation.cc",
     "debug/rendering_stats_instrumentation.h",
     "debug/ring_buffer.h",
-    "debug/traced_display_item_list.cc",
-    "debug/traced_display_item_list.h",
     "debug/traced_value.cc",
     "debug/traced_value.h",
     "debug/unittest_only_benchmark.cc",
     "debug/unittest_only_benchmark.h",
     "debug/unittest_only_benchmark_impl.cc",
     "debug/unittest_only_benchmark_impl.h",
     "input/browser_controls_offset_manager.cc",
     "input/browser_controls_offset_manager.h",
     "input/browser_controls_offset_manager_client.h",
     "input/input_handler.cc",
@@ skipping 939 matching lines @@
   data = [
     "test/data/",
 
     # Needed for isolate script to execute.
     "//testing/scripts/common.py",
     "//testing/xvfb.py",
     "//testing/scripts/run_gtest_perf_test.py",
     "//tools/perf/generate_legacy_perf_dashboard_json.py",
   ]
 }