fix(BrowserCapabilities) remove no longer used function

modules/browser/BrowserCapabilities.js

             && typeof navigator.mediaDevices.addEventListener !== 'undefined';
     }
 
-    /**
-     * Checks if the current browser supports RTT statistics for srflx local
-     * candidates through the legacy getStats() API.
-     */
-    supportsLocalCandidateRttStatistics() {
-        return this.isChromiumBased() || this.isReactNative() || this.isWebKitBased();
-    }
-
     /**
      * Checks if the current browser supports the Long Tasks API that lets us observe
      * performance measurement events and be notified of tasks that take longer than

types/auto/modules/browser/BrowserCapabilities.d.ts

      * @return {boolean}
      */
     supportsDeviceChangeEvent(): boolean;
-    /**
-     * Checks if the current browser supports RTT statistics for srflx local
-     * candidates through the legacy getStats() API.
-     */
-    supportsLocalCandidateRttStatistics(): any;
     /**
      * Checks if the current browser supports the Long Tasks API that lets us observe
      * performance measurement events and be notified of tasks that take longer than