[devtools] Remove device emulation background color override.

third_party/WebKit/public/web/WebDeviceEmulationParams.h

 // 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.
 
 #ifndef WebDeviceEmulationParams_h
 #define WebDeviceEmulationParams_h
 
 #include "../platform/WebFloatPoint.h"
 #include "../platform/WebPoint.h"
 #include "../platform/WebRect.h"
@@ skipping 32 matching lines @@
   // Scale of emulated view inside available space, not in fit to view mode.
   float scale;
 
   // Optional screen orientation type, with WebScreenOrientationUndefined
   // value meaning no emulation necessary.
   WebScreenOrientationType screen_orientation_type;
 
   // Screen orientation angle, used together with screenOrientationType.
   int screen_orientation_angle;
 
+  // Whether to override the gutter color to a dark gray. If enabled, this will
+  // affect the rendering of pages if the page does not set a background color.
+  bool override_gutter_color;
+
   WebDeviceEmulationParams()
       : screen_position(kDesktop),
         device_scale_factor(0),
         fit_to_view(false),
         scale(1),
         screen_orientation_type(kWebScreenOrientationUndefined),
-        screen_orientation_angle(0) {}
+        screen_orientation_angle(0),
+        override_gutter_color(true) {}
 };
 
 inline bool operator==(const WebDeviceEmulationParams& a,
                        const WebDeviceEmulationParams& b) {
   return a.screen_position == b.screen_position &&
          a.screen_size == b.screen_size && a.view_position == b.view_position &&
          a.device_scale_factor == b.device_scale_factor &&
          a.view_size == b.view_size && a.fit_to_view == b.fit_to_view &&
          a.offset == b.offset && a.scale == b.scale &&
          a.screen_orientation_type == b.screen_orientation_type &&
-         a.screen_orientation_angle == b.screen_orientation_angle;
+         a.screen_orientation_angle == b.screen_orientation_angle &&
+         a.override_gutter_color == b.override_gutter_color;
 }
 
 inline bool operator!=(const WebDeviceEmulationParams& a,
                        const WebDeviceEmulationParams& b) {
   return !(a == b);
 }
 
 }  // namespace blink
 
 #endif