webrtc: remove google ice sdp munging

GICE was removed in M43

BUG=webrtc:4299

Change-Id: Ia993601e16948de380ed968e3d1ead2e5bf7a34b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2552868Reviewed-by: Harald Alvestrand <hta@chromium.org>
Commit-Queue: Philipp Hancke <philipp.hancke@googlemail.com>
Cr-Commit-Position: refs/heads/master@{#830160}

content/test/data/media/peerconnection-call-data.html

@@ -33,7 +33,7 @@
   // Test that we can setup call with legacy settings.
   function callWithLegacySdp() {
     setOfferSdpTransform(function(sdp) {
-      return removeBundle(useGice(useExternalSdes(sdp)));
+      return removeBundle(useExternalSdes(sdp));
     });
     createConnections({
       'mandatory': {'RtpDataChannels': true, 'DtlsSrtpKeyAgreement': false}
@@ -285,13 +285,6 @@
     return sdp.replace(/a=group:BUNDLE .*\r\n/g, '');
   }
 
-  function useGice(sdp) {
-    sdp = sdp.replace(/t=.*\r\n/g, function(subString) {
-      return subString + 'a=ice-options:google-ice\r\n';
-    });
-    return sdp;
-  }
-
   function useExternalSdes(sdp) {
     // Remove current crypto specification.
     sdp = sdp.replace(/a=crypto.*\r\n/g, '');