cc: Remove OverdrawMetrics and --trace-overdraw flag.

cc/trees/layer_tree_settings.cc

 // Copyright 2011 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.
 
 #include "cc/trees/layer_tree_settings.h"
 
 #include <limits>
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
 
 namespace cc {
 
 LayerTreeSettings::LayerTreeSettings()
     : impl_side_painting(false),
       allow_antialiasing(true),
       throttle_frame_production(true),
       begin_impl_frame_scheduling_enabled(false),
       using_synchronous_renderer_compositor(false),
       per_tile_painting_enabled(false),
       partial_swap_enabled(false),
       accelerated_animation_enabled(true),
-      show_overdraw_in_tracing(false),
       can_use_lcd_text(true),
       should_clear_root_render_pass(true),
       rasterization_site(CpuRasterization),
       scrollbar_animator(NoAnimator),
       scrollbar_linear_fade_delay_ms(300),
       scrollbar_linear_fade_length_ms(300),
       solid_color_scrollbar_color(SK_ColorWHITE),
       calculate_top_controls_position(false),
       use_memory_management(true),
       timeout_and_draw_when_animation_checkerboards(true),
@@ skipping 21 matching lines @@
       strict_layer_property_change_checking(false),
       use_map_image(false),
       ignore_root_layer_flings(false),
       use_rgba_4444_textures(false),
       touch_hit_testing(true),
       texture_id_allocation_chunk_size(64) {}
 
 LayerTreeSettings::~LayerTreeSettings() {}
 
 }  // namespace cc