[devtools] Remove device emulation background color override.

third_party/WebKit/Source/web/DevToolsEmulator.cpp

Index: third_party/WebKit/Source/web/DevToolsEmulator.cpp
diff --git a/third_party/WebKit/Source/web/DevToolsEmulator.cpp b/third_party/WebKit/Source/web/DevToolsEmulator.cpp
index 57fbf87f94e619474feaf05a1b5fb0bfa4b9da3d..88a143d361a791df2f8698827417c154b401e8b4 100644
--- a/third_party/WebKit/Source/web/DevToolsEmulator.cpp
+++ b/third_party/WebKit/Source/web/DevToolsEmulator.cpp
@@ -226,7 +226,7 @@ void DevToolsEmulator::EnableDeviceEmulation(
 
   if (!device_metrics_enabled_) {
     device_metrics_enabled_ = true;
-    if (params.view_size.width || params.view_size.height)
+    if (params.override_gutter_color)
       web_view_impl_->SetBackgroundColorOverride(Color::kDarkGray);

[dgozman, 2017/04/11 17:29:54]

Let's just not override at all. DevTools currently does not benefit from this,
and we have a different method for RDP users.

[Eric Seckler, 2017/04/12 07:38:44]

Perfect! Done.

   }
 
@@ -258,7 +258,8 @@ void DevToolsEmulator::DisableDeviceEmulation() {
 
   GetMemoryCache()->EvictResources();
   device_metrics_enabled_ = false;
-  web_view_impl_->ClearBackgroundColorOverride();
+  if (emulation_params_.override_gutter_color)
+    web_view_impl_->ClearBackgroundColorOverride();
   web_view_impl_->GetPage()->GetSettings().SetDeviceScaleAdjustment(
       embedder_device_scale_adjustment_);
   DisableMobileEmulation();