DevTools: fix CSS parser to properly report last parsed chunk

Source/devtools/front_end/CSSParser.js

 /**
  * Copyright 2014 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 /**
  * @constructor
  * @extends {WebInspector.Object}
  */
@@ skipping 70 matching lines @@
     /**
      * @param {!MessageEvent} event
      */
     _onRuleChunk: function(event)
     {
         var data = /** @type {!WebInspector.CSSParser.DataChunk} */ (event.data);
         var chunk = data.chunk;
         for (var i = 0; i < chunk.length; ++i)
             this._rules.push(chunk[i]);
 
-        if (data.index === data.total - 1)
+        if (data.isLastChunk)
             this._onFinishedParsing();
         this.dispatchEventToListeners(WebInspector.CSSParser.Events.RulesParsed);
     },
 
     _onFinishedParsing: function()
     {
         this._unlock();
         if (this._finishedCallback)
             this._finishedCallback(this._rules);
     },
 
     __proto__: WebInspector.Object.prototype,
 }
 
 /**
- * @typedef {{index: number, total: number, chunk: !Array.<!WebInspector.CSSParser.Rule>}}
+ * @typedef {{isLastChunk: boolean, chunk: !Array.<!WebInspector.CSSParser.Rule>}}
  */
 WebInspector.CSSParser.DataChunk;
 
 /**
  * @typedef {{selectorText: string, lineNumber: number, columnNumber: number, properties: !Array.<!WebInspector.CSSParser.Property>}}
  */
 WebInspector.CSSParser.StyleRule;
 
 /**
  * @typedef {{atRule: string, lineNumber: number, columnNumber: number}}
  */
 WebInspector.CSSParser.AtRule;
 
 /**
  * @typedef {(WebInspector.CSSParser.StyleRule|WebInspector.CSSParser.AtRule)}
  */
 WebInspector.CSSParser.Rule;
 
 /**
  * @typedef {{name: string, value: string}}
  */
 WebInspector.CSSParser.Property;