Roll WebRTC from ef9c4e07a351 to 1e98f9539164 (3 revisions)

https://webrtc.googlesource.com/src.git/+log/ef9c4e07a351..1e98f9539164

2020-12-21 philipp.hancke@googlemail.com sdp: remove some unused x-google attributes
2020-12-21 nisse@webrtc.org Delete unneeded dependencies on the Module abstraction
2020-12-21 webrtc-version-updater@webrtc-ci.iam.gserviceaccount.com Update WebRTC code version (2020-12-21T04:04:21).

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/webrtc-chromium-autoroll
Please CC webrtc-chromium-sheriffs-robots@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/master/autoroll/README.md

Bug: chromium:943975
Tbr: webrtc-chromium-sheriffs-robots@google.com
Change-Id: I824fc077c493cb8da0f9455467530413543d1cbb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2599626Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#838658}

DEPS

@@ -1514,7 +1514,7 @@ deps = {
     Var('chromium_git') + '/external/github.com/gpuweb/cts.git' + '@' + '3c2fe3888658d82b47ca831d59a2e07579619c2d',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + 'ef9c4e07a351c9396c72e72efaa1be3df728c440',
+    Var('webrtc_git') + '/src.git' + '@' + '1e98f95391647887d0db25dd5d9dcfba7f87ebd7',
 
   'src/third_party/libgifcodec':
      Var('skia_git') + '/libgifcodec' + '@'+  Var('libgifcodec_revision'),