DevTools: Make TextEditor.tokenAtTextPosition() return exclusive end column

Source/devtools/front_end/sources/JavaScriptSourceFrame.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 497 matching lines @@
             };
             anchorBox.forSelection = true;
             return anchorBox;
         }
 
         var token = this.textEditor.tokenAtTextPosition(textPosition.startLine, textPosition.startColumn);
         if (!token)
             return;
         var lineNumber = textPosition.startLine;
         var line = this.textEditor.line(lineNumber);
-        var tokenContent = line.substring(token.startColumn, token.endColumn + 1);
+        var tokenContent = line.substring(token.startColumn, token.endColumn);
 
         var isIdentifier = token.type.startsWith("js-variable") || token.type.startsWith("js-property") || token.type == "js-def";
         if (!isIdentifier && (token.type !== "js-keyword" || tokenContent !== "this"))
             return;
 
         var leftCorner = this.textEditor.cursorPositionToCoordinates(lineNumber, token.startColumn);
-        var rightCorner = this.textEditor.cursorPositionToCoordinates(lineNumber, token.endColumn + 1);
+        var rightCorner = this.textEditor.cursorPositionToCoordinates(lineNumber, token.endColumn - 1);
         var anchorBox = new AnchorBox(leftCorner.x, leftCorner.y, rightCorner.x - leftCorner.x, leftCorner.height);
 
         anchorBox.highlight = {
             lineNumber: lineNumber,
             startColumn: token.startColumn,
-            endColumn: token.endColumn
+            endColumn: token.endColumn - 1
         };
 
         return anchorBox;
     },
 
     _resolveObjectForPopover: function(anchorBox, showCallback, objectGroupName)
     {
         var target = WebInspector.context.flavor(WebInspector.Target);
         if (!target || !target.debuggerModel.isPaused()) {
             this._popoverHelper.hidePopover();
@@ skipping 368 matching lines @@
         this._uiSourceCode.removeEventListener(WebInspector.UISourceCode.Events.SourceMappingChanged, this._onSourceMappingChanged, this);
         this._uiSourceCode.removeEventListener(WebInspector.UISourceCode.Events.WorkingCopyChanged, this._workingCopyChanged, this);
         this._uiSourceCode.removeEventListener(WebInspector.UISourceCode.Events.WorkingCopyCommitted, this._workingCopyCommitted, this);
         this._uiSourceCode.removeEventListener(WebInspector.UISourceCode.Events.TitleChanged, this._showBlackboxInfobarIfNeeded, this);
         WebInspector.settings.skipStackFramesPattern.removeChangeListener(this._showBlackboxInfobarIfNeeded, this);
         WebInspector.UISourceCodeFrame.prototype.dispose.call(this);
     },
 
     __proto__: WebInspector.UISourceCodeFrame.prototype
 }