DevTools: use target-based model accessors only.

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 2436 matching lines @@
  * @extends {WebInspector.StylePropertiesSection}
  * @param {!WebInspector.StylesSidebarPane} stylesPane
  * @param {string} defaultSelectorText
  * @param {string} styleSheetId
  * @param {!WebInspector.TextRange} ruleLocation
  * @param {!WebInspector.StylesSectionModel} insertAfterStyleRule
  */
 WebInspector.BlankStylePropertiesSection = function(stylesPane, defaultSelectorText, styleSheetId, ruleLocation, insertAfterStyleRule)
 {
     var dummyCascade = new WebInspector.SectionCascade();
-    var blankSectionModel = dummyCascade.appendModelFromStyle(WebInspector.CSSStyleDeclaration.createDummyStyle(), defaultSelectorText);
+    var blankSectionModel = dummyCascade.appendModelFromStyle(WebInspector.CSSStyleDeclaration.createDummyStyle(stylesPane._target), defaultSelectorText);
     blankSectionModel.setEditable(true);
     WebInspector.StylePropertiesSection.call(this, stylesPane, blankSectionModel);
     this._ruleLocation = ruleLocation;
     this._styleSheetId = styleSheetId;
     this._selectorRefElement.removeChildren();
     this._selectorRefElement.appendChild(WebInspector.StylePropertiesSection._linkifyRuleLocation(this._parentPane._target, this._parentPane._linkifier, styleSheetId, this._actualRuleLocation()));
     if (insertAfterStyleRule)
         this._createMediaList(insertAfterStyleRule.media());
     this._insertAfterStyleRule = insertAfterStyleRule;
     this.element.classList.add("blank-section");
@@ skipping 1578 matching lines @@
 
 WebInspector.StylesSidebarPane.MatchedRulesPayload.prototype = {
     /**
      * @return {boolean}
      */
     fulfilled: function()
     {
         return !!(this.matchedCSSRules && this.pseudoElements && this.inherited);
     }
 }