[DevTools] Add groups to device select.

Source/devtools/front_end/ResponsiveDesignView.js

Index: Source/devtools/front_end/ResponsiveDesignView.js
diff --git a/Source/devtools/front_end/ResponsiveDesignView.js b/Source/devtools/front_end/ResponsiveDesignView.js
index cc24172d06a4a60c0b422739f2fa52eaf7ad3ee6..7c92b1dda4b7814201bc1088813b53b7aa01e0f0 100644
--- a/Source/devtools/front_end/ResponsiveDesignView.js
+++ b/Source/devtools/front_end/ResponsiveDesignView.js
@@ -29,7 +29,7 @@ WebInspector.ResponsiveDesignView = function(inspectedPagePlaceholder)
     this._warningMessage.createChild("div", "warning-icon-small");
     this._warningMessage.createChild("span");
     var warningCloseButton = this._warningMessage.createChild("div", "close-button");
-    warningCloseButton.addEventListener("click", this._closeOverridesWarning.bind(this), false);
+    warningCloseButton.addEventListener("click", WebInspector.overridesSupport.clearWarningMessage.bind(WebInspector.overridesSupport), false);
     WebInspector.overridesSupport.addEventListener(WebInspector.OverridesSupport.Events.OverridesWarningUpdated, this._overridesWarningUpdated, this);
 
     this._slidersContainer = this._canvasContainer.element.createChild("div", "vbox responsive-design-sliders-container");
@@ -481,12 +481,6 @@ WebInspector.ResponsiveDesignView.prototype = {
         this.onResize();
     },
 
-    _closeOverridesWarning: function()
-    {
-        this._warningMessage.querySelector("span").textContent = "";
-        this._warningMessage.classList.add("hidden");
-    },
-
     _showEmulationInDrawer: function()
     {
         WebInspector.overridesSupport.reveal();