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

Source/devtools/front_end/sdk/OverridesSupport.js

Index: Source/devtools/front_end/sdk/OverridesSupport.js
diff --git a/Source/devtools/front_end/sdk/OverridesSupport.js b/Source/devtools/front_end/sdk/OverridesSupport.js
index ede7408e6c1d7af1a5ae3192d624d9176afa6cfe..2d859a434fcd0174703f6be60015943068415c42 100644
--- a/Source/devtools/front_end/sdk/OverridesSupport.js
+++ b/Source/devtools/front_end/sdk/OverridesSupport.js
@@ -602,9 +602,9 @@ WebInspector.OverridesSupport.prototype = {
     _onPageResizerResizeRequested: function(event)
     {
         var size = /** @type {!Size} */ (event.data);
-        if (size.width !== this.settings.deviceWidth.get())
+        if (size.width >= 0 && size.width !== this.settings.deviceWidth.get())
             this.settings.deviceWidth.set(size.width);
-        if (size.height !== this.settings.deviceHeight.get())
+        if (size.height >= 0 && size.height !== this.settings.deviceHeight.get())
             this.settings.deviceHeight.set(size.height);
     },