[DevTools] Consolidate overlay-related functionality in Overlay domain

third_party/WebKit/Source/devtools/front_end/elements/StylesSidebarPane.js

 /*
  * Copyright (C) 2007 Apple Inc.  All rights reserved.
  * Copyright (C) 2009 Joseph Pecoraro
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 818 matching lines @@
     if (this._style.type === SDK.CSSStyleDeclaration.Type.Inline)
       return this._matchedStyles.isInherited(this._style) ? Common.UIString('Style Attribute') : 'element.style';
     if (this._style.type === SDK.CSSStyleDeclaration.Type.Attributes)
       return node.nodeNameInCorrectCase() + '[' + Common.UIString('Attributes Style') + ']';
     return this._style.parentRule.selectorText();
   }
 
   _onMouseOutSelector() {
     if (this._hoverTimer)
       clearTimeout(this._hoverTimer);
-    SDK.DOMModel.hideDOMNodeHighlight();
+    SDK.OverlayModel.hideDOMNodeHighlight();
   }
 
   _onMouseEnterSelector() {
     if (this._hoverTimer)
       clearTimeout(this._hoverTimer);
     this._hoverTimer = setTimeout(this._highlight.bind(this), 300);
   }
 
   _highlight() {
-    SDK.DOMModel.hideDOMNodeHighlight();
+    SDK.OverlayModel.hideDOMNodeHighlight();
     var node = this._parentPane.node();
-    var domModel = node.domModel();
     var selectors = this._style.parentRule ? this._style.parentRule.selectorText() : undefined;
-    domModel.highlightDOMNodeWithConfig(node.id, {mode: 'all', showInfo: undefined, selectors: selectors});
+    node.domModel().overlayModel().highlightDOMNodeWithConfig(
+        node.id, {mode: 'all', showInfo: undefined, selectors: selectors});
   }
 
   /**
    * @return {?Elements.StylePropertiesSection}
    */
   firstSibling() {
     var parent = this.element.parentElement;
     if (!parent)
       return null;
 
@@ skipping 2278 matching lines @@
   }
 
   /**
    * @override
    * @return {!UI.ToolbarItem}
    */
   item() {
     return this._button;
   }
 };