Removing unnecessary code

Author: ambauma

core/src/main/scala/org/apache/spark/ui/UIUtils.scala

@@ -511,18 +511,6 @@ private[spark] object UIUtils extends Logging {
   def getTimeZoneOffset() : Int =
     TimeZone.getDefault().getOffset(System.currentTimeMillis()) / 1000 / 60
 
-  /**
-  * Return the correct Href after checking if master is running in the
-  * reverse proxy mode or not.
-  */
-  def makeHref(proxy: Boolean, id: String, origHref: String): String = {
-    if (proxy) {
-      s"/proxy/$id"
-    } else {
-      origHref
-    }
-  }
-
   /**
    * Remove suspicious characters of user input to prevent Cross-Site scripting (XSS) attacks
    *