Revert "Remove constrained baseline profile support for H264 in M86."

This reverts commit 3234b57f.

Reason for revert: AUD stripping patch from WebRTC has been rolled to Chromium: https://webrtc.googlesource.com/src/+/9345dcfeea73f9dd68dc83dee60255e86dac3f97 and https://source.chromium.org/chromium/chromium/src/+/76165ce5bf99790f8dbae685259723e867458337. CBP for H264 support can come back in.

Original change's description:
> Remove constrained baseline profile support for H264 in M86.
>
> Bug: 982799
> Change-Id: Ibe20d74bfe6182b8464855106ca2d09f5dca087c
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2363462
> Commit-Queue: Chunbo Hua <chunbo.hua@intel.com>
> Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
> Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#799783}

TBR=dalecurtis@chromium.org,chunbo.hua@intel.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 982799
Change-Id: Ib1c0212181d7efffe1cd4b82a0a1ddc9a603a0f3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2427573Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Chunbo Hua <chunbo.hua@intel.com>
Cr-Commit-Position: refs/heads/master@{#811571}

third_party/blink/renderer/platform/peerconnection/rtc_video_encoder_factory.cc

@@ -169,6 +169,8 @@ SupportedFormats GetSupportedFormatsInternal(
     }
   }
 
+  cricket::AddH264ConstrainedBaselineProfileToSupportedFormats(
+      &supported_formats.sdp_formats);
   return supported_formats;
 }