DevTools: fix private field usage violation discovered after the compiler roll.

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

 /*
  * Copyright (C) 2013 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 252 matching lines @@
     var bezierString = /** @type {string} */ (event.data);
     this._currentSwatch.setBezierText(bezierString);
     this._changeSwatchText(bezierString);
   }
 
   /**
    * @param {string} text
    */
   _changeSwatchText(text) {
     this._hadSwatchChange = true;
-    this._textEditor.editRange(this._editedSwatchTextRange, text, '*swatch-text-changed');
+    this.textEditor.editRange(this._editedSwatchTextRange, text, '*swatch-text-changed');
     this._editedSwatchTextRange.endColumn = this._editedSwatchTextRange.startColumn + text.length;
   }
 
   /**
    * @param {boolean} commitEdit
    */
   _swatchPopoverHidden(commitEdit) {
     this._muteSwatchProcessing = false;
     if (!commitEdit && this._hadSwatchChange)
       this.textEditor.undo();
@@ skipping 26 matching lines @@
   _isWordChar(char) {
     return Common.TextUtils.isWordChar(char) || char === '.' || char === '-' || char === '$';
   }
 
   /**
    * @param {!Common.TextRange} prefixRange
    * @param {!Common.TextRange} substituteRange
    * @return {?Promise.<!UI.SuggestBox.Suggestions>}
    */
   _cssSuggestions(prefixRange, substituteRange) {
-    var prefix = this._textEditor.text(prefixRange);
+    var prefix = this.textEditor.text(prefixRange);
     if (prefix.startsWith('$'))
       return null;
 
     var propertyToken = this._backtrackPropertyToken(prefixRange.startLine, prefixRange.startColumn - 1);
     if (!propertyToken)
       return null;
 
-    var line = this._textEditor.line(prefixRange.startLine);
+    var line = this.textEditor.line(prefixRange.startLine);
     var tokenContent = line.substring(propertyToken.startColumn, propertyToken.endColumn);
     var propertyValues = SDK.cssMetadata().propertyValues(tokenContent);
     return Promise.resolve(propertyValues.filter(value => value.startsWith(prefix)).map(value => ({title: value})));
   }
 
   /**
    * @param {number} lineNumber
    * @param {number} columnNumber
    * @return {?{startColumn: number, endColumn: number, type: string}}
    */
   _backtrackPropertyToken(lineNumber, columnNumber) {
     var backtrackDepth = 10;
     var tokenPosition = columnNumber;
-    var line = this._textEditor.line(lineNumber);
+    var line = this.textEditor.line(lineNumber);
     var seenColon = false;
 
     for (var i = 0; i < backtrackDepth && tokenPosition >= 0; ++i) {
-      var token = this._textEditor.tokenAtTextPosition(lineNumber, tokenPosition);
+      var token = this.textEditor.tokenAtTextPosition(lineNumber, tokenPosition);
       if (!token)
         return null;
       if (token.type === 'css-property')
         return seenColon ? token : null;
       if (token.type && !(token.type.indexOf('whitespace') !== -1 || token.type.startsWith('css-comment')))
         return null;
 
       if (!token.type && line.substring(token.startColumn, token.endColumn) === ':') {
         if (!seenColon)
           seenColon = true;
         else
           return null;
       }
       tokenPosition = token.startColumn - 1;
     }
     return null;
   }
 };
 
 /** @type {number} */
 Sources.CSSSourceFrame.maxSwatchProcessingLength = 300;
 /** @type {symbol} */
 Sources.CSSSourceFrame.SwatchBookmark = Symbol('swatch');