Enable `VideoReceiveStreamTestWithFakeDecoder.RenderedFrameUpdatesGetSources` for iOS.

This change re-enables a previously flaky unit tests for iOS. It seems to have the same root cause as webrtc:10827 and which was fixed by: https://webrtc-review.googlesource.com/c/src/+/149171

Bug: webrtc:10872, webrtc:10827
Change-Id: I71b2581cf8c75e0dd6a39b77e6cf34c121ff22f4
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/149802
Reviewed-by: Niels Moller <nisse@webrtc.org>
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Reviewed-by: Jonas Oreland <jonaso@webrtc.org>
Commit-Queue: Chen Xing <chxg@google.com>
Cr-Commit-Position: refs/heads/master@{#28893}
diff --git a/video/video_receive_stream_unittest.cc b/video/video_receive_stream_unittest.cc
index 2f9564e..6d88f67 100644
--- a/video/video_receive_stream_unittest.cc
+++ b/video/video_receive_stream_unittest.cc
@@ -313,13 +313,7 @@
   EXPECT_THAT(fake_renderer_.packet_infos(), ElementsAreArray(packet_infos));
 }
 
-// TODO(crbug.com/webrtc/10872): Re-enable on iOS
-#if defined(WEBRTC_IOS)
-TEST_F(VideoReceiveStreamTestWithFakeDecoder,
-       DISABLED_RenderedFrameUpdatesGetSources) {
-#else
 TEST_F(VideoReceiveStreamTestWithFakeDecoder, RenderedFrameUpdatesGetSources) {
-#endif
   constexpr uint32_t kSsrc = 1111;
   constexpr uint32_t kCsrc = 9001;
   constexpr uint32_t kRtpTimestamp = 12345;