DevTools: fix CSS parser to properly report last parsed chunk

Source/devtools/front_end/ScriptFormatterWorker.js

 /*
  * Copyright (C) 2011 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 194 matching lines @@
     Selector: "Selector",
     Style: "Style",
     PropertyName: "PropertyName",
     PropertyValue: "PropertyValue",
     AtRule: "AtRule",
 };
 
 FormatterWorker.parseCSS = function(params)
 {
     var chunkSize = 100000; // characters per data chunk
-    var totalLength = params.content.length;
     var lines = params.content.split("\n");
-    var chunkCount = FormatterWorker._chunkCount(totalLength, chunkSize);
     var rules = [];
     var processedChunkCharacters = 0;
-    var currentChunk = 0;
 
     var state = FormatterWorker.CSSParserStates.Initial;
     var rule;
     var property;
     var UndefTokenType = {};
 
     /**
      * @param {string} tokenValue
      * @param {?string} tokenTypes
      * @param {number} column
@@ skipping 70 matching lines @@
                 state = FormatterWorker.CSSParserStates.Initial;
             } else if (!tokenType["comment"]) {
                 property.value += tokenValue;
             }
             break;
         default:
             console.assert(false, "Unknown CSS parser state.");
         }
         processedChunkCharacters += newColumn - column;
         if (processedChunkCharacters > chunkSize) {
-            postMessage({ chunk: rules, total: chunkCount, index: currentChunk++ });
+            postMessage({ chunk: rules, isLastChunk: false });
             rules = [];
             processedChunkCharacters = 0;
         }
     }
     var tokenizer = FormatterWorker.createTokenizer("text/css");
     var lineNumber;
     for (lineNumber = 0; lineNumber < lines.length; ++lineNumber) {
         var line = lines[lineNumber];
         tokenizer(line, processToken);
     }
-    postMessage({ chunk: rules, total: chunkCount, index: currentChunk++ });
+    postMessage({ chunk: rules, isLastChunk: true });
 }
 
 /**
  * @param {string} content
  * @param {!{original: !Array.<number>, formatted: !Array.<number>}} mapping
  * @param {number} offset
  * @param {number} formattedOffset
  * @param {string} indentString
  * @return {string}
  */
@@ skipping 167 matching lines @@
 
 /**
  * @type {!{tokenizer}}
  */
 var exports = { tokenizer: null };
 importScripts("UglifyJS/parse-js.js");
 var parse = exports;
 
 importScripts("JavaScriptFormatter.js");
 importScripts("CSSFormatter.js");