DevTools: get rid of Element.prototype.removeMatchingStyleClasses

Source/devtools/front_end/ui/DOMExtension.js

Index: Source/devtools/front_end/ui/DOMExtension.js
diff --git a/Source/devtools/front_end/ui/DOMExtension.js b/Source/devtools/front_end/ui/DOMExtension.js
index e054e3bb035fc5262b4e6630f286bf849306e933..822d083d90ea82ed287c18e710b139c8522e5f8f 100644
--- a/Source/devtools/front_end/ui/DOMExtension.js
+++ b/Source/devtools/front_end/ui/DOMExtension.js
@@ -156,13 +156,6 @@ Node.prototype.rangeBoundaryForOffset = function(offset)
     return { container: node, offset: offset };
 }
 
-Element.prototype.removeMatchingStyleClasses = function(classNameRegex)
-{
-    var regex = new RegExp("(^|\\s+)" + classNameRegex + "($|\\s+)");
-    if (regex.test(this.className))
-        this.className = this.className.replace(regex, " ");
-}
-
 /**
  * @param {number|undefined} x
  * @param {number|undefined} y