[DevTools] Replace the target type with capabilities

third_party/WebKit/Source/devtools/front_end/sdk/CSSModel.js

 /*
  * Copyright (C) 2010 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 1155 matching lines @@
         }
     }
 }
 
 /**
  * @param {!WebInspector.Target} target
  * @return {?WebInspector.CSSModel}
  */
 WebInspector.CSSModel.fromTarget = function(target)
 {
-    if (!target.isPage())
-        return null;
     return /** @type {?WebInspector.CSSModel} */ (target.model(WebInspector.CSSModel));
 }
 
 /**
  * @param {!WebInspector.DOMNode} node
  * @return {!WebInspector.CSSModel}
  */
 WebInspector.CSSModel.fromNode = function(node)
 {
     return /** @type {!WebInspector.CSSModel} */ (WebInspector.CSSModel.fromTarget(node.target()));
 }
 
 /**
  * @constructor
  * @param {?WebInspector.CSSStyleDeclaration} inlineStyle
  * @param {?WebInspector.CSSStyleDeclaration} attributesStyle
  */
 WebInspector.CSSModel.InlineStyleResult = function(inlineStyle, attributesStyle)
 {
     this.inlineStyle = inlineStyle;
     this.attributesStyle = attributesStyle;
 }