[devtools] Remove device emulation background color override.

content/renderer/devtools/render_widget_screen_metrics_emulator.cc

Index: content/renderer/devtools/render_widget_screen_metrics_emulator.cc
diff --git a/content/renderer/devtools/render_widget_screen_metrics_emulator.cc b/content/renderer/devtools/render_widget_screen_metrics_emulator.cc
index 1ebfc361f8bad48a4ca4c4c86bcbe1f1bafb2b11..f6a4ab237048b716910e15a198c889019f58fd35 100644
--- a/content/renderer/devtools/render_widget_screen_metrics_emulator.cc
+++ b/content/renderer/devtools/render_widget_screen_metrics_emulator.cc
@@ -145,9 +145,6 @@ void RenderWidgetScreenMetricsEmulator::Apply() {
 
   delegate_->SetScreenRects(applied_widget_rect_, window_screen_rect);
 
-  modified_resize_params.physical_backing_size =

[Eric Seckler, 2017/04/12 16:18:46]

@Dmirty: This was causing a test failure b/c of an off-by-one rounding error
(see android bot on patch set 2). I don't think that this statement is actually
necessary, since it seems to (inaccurately) recompute the same value that would
have been set in original_resize_params_ already. But maybe I'm missing
something - WDYT?

[dgozman, 2017/04/12 18:21:23]

You are right. I guess this has evolved to be useless now :-)

-      gfx::ScaleToCeiledSize(original_resize_params_.new_size,
-                             original_screen_info().device_scale_factor);
   modified_resize_params.new_size = applied_widget_rect_.size();
   modified_resize_params.visible_viewport_size = applied_widget_rect_.size();
   modified_resize_params.needs_resize_ack = false;