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

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 66 matching lines @@
         var token = this.textEditor.tokenAtTextPosition(selection.startLine, selection.startColumn);
         if (!token) {
             if (selection.startColumn > 0)
                 token = this.textEditor.tokenAtTextPosition(selection.startLine, selection.startColumn - 1);
             if (!token)
                 return false;
         }
         if (token.type !== "css-number")
             return false;
 
-        var cssUnitRange = new WebInspector.TextRange(selection.startLine, token.startColumn, selection.startLine, token.endColumn + 1);
+        var cssUnitRange = new WebInspector.TextRange(selection.startLine, token.startColumn, selection.startLine, token.endColumn);
         var cssUnitText = this.textEditor.copyRange(cssUnitRange);
         var newUnitText = this._modifyUnit(cssUnitText, change);
         if (!newUnitText)
             return false;
         this.textEditor.editRange(cssUnitRange, newUnitText);
         selection.startColumn = token.startColumn;
         selection.endColumn = selection.startColumn + newUnitText.length;
         this.textEditor.setSelection(selection);
         return true;
     },
 
     __proto__: WebInspector.UISourceCodeFrame.prototype
 }