Issue 7284 - Move CSS escaping to createStyleSheet

lib/content/elemHideEmulation.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 393 matching lines @@
 {
   constructor(propertyExpression)
   {
     this.dependsOnStyles = true;
     this.dependsOnDOM = true;
 
     let regexpString;
     if (propertyExpression.length >= 2 && propertyExpression[0] == "/" &&
         propertyExpression[propertyExpression.length - 1] == "/")
     {
-      regexpString = propertyExpression.slice(1, -1)
-        .replace("\\7B ", "{").replace("\\7D ", "}");
+      regexpString = propertyExpression.slice(1, -1);
     }
     else
       regexpString = filterToRegExp(propertyExpression);
 
     this._regexp = new RegExp(regexpString, "i");
   }
 
   *findPropsSelectors(styles, prefix, regexp)
   {
     for (let style of styles)
@@ skipping 539 matching lines @@
           characterData: shouldObserveCharacterData(this.patterns),
           subtree: true
         }
       );
       this.document.addEventListener("load", this.onLoad.bind(this), true);
     }
   }
 }
 
 exports.ElemHideEmulation = ElemHideEmulation;