DevTools: remove illusionary caching from String.prototype.lineEndings

third_party/WebKit/Source/devtools/front_end/sources/SourceMapNamesResolver.js

 // Copyright 2016 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.
 
 WebInspector.SourceMapNamesResolver = {};
 
 WebInspector.SourceMapNamesResolver._cachedMapSymbol = Symbol("cache");
 WebInspector.SourceMapNamesResolver._cachedPromiseSymbol = Symbol("cachePromise");
 
 /**
@@ skipping 31 matching lines @@
      */
     function onContent(content)
     {
         if (!content)
             return new Map();
 
         var startLocation = scope.startLocation();
         var endLocation = scope.endLocation();
         var textRange = new WebInspector.TextRange(startLocation.lineNumber, startLocation.columnNumber, endLocation.lineNumber, endLocation.columnNumber);
 
-        var scopeText = textRange.extract(content);
-        var scopeStart = textRange.toSourceRange(content).offset;
+        var text = new WebInspector.Text(content);
+        var scopeText = text.extract(textRange);
+        var scopeStart = text.toSourceRange(textRange).offset;
         var prefix = "function fui";
         var root = acorn.parse(prefix + scopeText, {});
         /** @type {!Array<!ESTree.Node>} */
         var identifiers = [];
         var functionDeclarationCounter = 0;
         var walker = new WebInspector.ESTreeWalker(beforeVisit, afterVisit);
 
         /**
          * @param {!ESTree.Node} node
          * @return {boolean}
@@ skipping 141 matching lines @@
 
     /**
      * @param {?string} content
      * @return {string}
      */
     function onContent(content)
     {
         if (!content)
             return "";
 
+        var text = new WebInspector.Text(content);
         var textRange = sourceMap.reverseMapTextRange(uiSourceCode.url(), new WebInspector.TextRange(lineNumber, startColumnNumber, lineNumber, endColumnNumber));
-        var originalText = textRange.extract(content);
+        var originalText = text.extract(textRange);
         if (!originalText)
             return "";
 
         var tokenizer = acorn.tokenizer(originalText, {ecmaVersion: 6});
         try {
             var token = tokenizer.getToken();
             while (token.type !== acorn.tokTypes.eof && WebInspector.AcornTokenizer.punctuator(token))
                 token = tokenizer.getToken();
 
             var startIndex = token.start;
@@ skipping 283 matching lines @@
      * @override
      * @param {function(?Array<!DebuggerAgent.CollectionEntry>)} callback
      */
     collectionEntries: function(callback)
     {
         this._object.collectionEntries(callback);
     },
 
     __proto__: WebInspector.RemoteObject.prototype
 }