[devtools] Remove device emulation background color override.

content/browser/devtools/protocol/emulation_handler.h

 // Copyright 2015 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 CONTENT_BROWSER_DEVTOOLS_PROTOCOL_EMULATION_HANDLER_H_
 #define CONTENT_BROWSER_DEVTOOLS_PROTOCOL_EMULATION_HANDLER_H_
 
 #include "base/macros.h"
 #include "content/browser/devtools/protocol/devtools_domain_handler.h"
 #include "content/browser/devtools/protocol/emulation.h"
@@ skipping 31 matching lines @@
       double device_scale_factor,
       bool mobile,
       bool fit_window,
       Maybe<double> scale,
       Maybe<double> offset_x,
       Maybe<double> offset_y,
       Maybe<int> screen_widget,
       Maybe<int> screen_height,
       Maybe<int> position_x,
       Maybe<int> position_y,
-      Maybe<Emulation::ScreenOrientation> screen_orientation) override;
+      Maybe<Emulation::ScreenOrientation> screen_orientation,
+      Maybe<bool> override_gutter_color) override;
   Response ClearDeviceMetricsOverride() override;
 
   Response SetVisibleSize(int width, int height) override;
 
  private:
   WebContentsImpl* GetWebContents();
   void UpdateTouchEventEmulationState();
   void UpdateDeviceEmulationState();
 
   bool touch_emulation_enabled_;
   std::string touch_emulation_configuration_;
 
   bool device_emulation_enabled_;
   blink::WebDeviceEmulationParams device_emulation_params_;
 
   RenderFrameHostImpl* host_;
 
   DISALLOW_COPY_AND_ASSIGN(EmulationHandler);
 };
 
 }  // namespace protocol
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DEVTOOLS_PROTOCOL_EMULATION_HANDLER_H_