[DevTools] Limit responsive design resize request to width/height only.

Source/devtools/front_end/sdk/OverridesSupport.js

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 583 matching lines @@
     },
 
     _onPageResizerAvailableSizeChanged: function()
     {
         if (this._initialized)
             this._deviceMetricsChanged();
     },
 
     _onPageResizerResizeRequested: function(event)
     {
-        var size = /** @type {!Size} */ (event.data);
-        if (size.width !== this.settings.deviceWidth.get())
-            this.settings.deviceWidth.set(size.width);
-        if (size.height !== this.settings.deviceHeight.get())
-            this.settings.deviceHeight.set(size.height);
+        if (typeof event.data.width !== "undefined") {
+            var width = /** @type {number} */ (event.data.width);
+            if (width !== this.settings.deviceWidth.get())
+                this.settings.deviceWidth.set(width);
+        }
+        if (typeof event.data.height !== "undefined") {
+            var height = /** @type {number} */ (event.data.height);
+            if (height !== this.settings.deviceHeight.get())
+                this.settings.deviceHeight.set(height);
+        }
     },
 
     _deviceMetricsChanged: function()
     {
         this._showRulersChanged();
 
         if (this._deviceMetricsChangedListenerMuted)
             return;
         var responsiveDesignAvailableAndDisabled = this._responsiveDesignAvailable && (!WebInspector.settings.responsiveDesign.enabled.get() || !this._pageResizer);
         var overrideDeviceResolution = this.settings.overrideDeviceResolution.get();
@@ skipping 465 matching lines @@
     },
 
     __proto__: WebInspector.Object.prototype
 }
 
 
 /**
  * @type {!WebInspector.OverridesSupport}
  */
 WebInspector.overridesSupport;