Revert "[RTCInsertableStreams] Add new tests"

This reverts commit 3ab3a892.

Reason for revert: consistently fails on Linux Tests (dbg)(1)

[3865/4436] fast/peerconnection/RTCPeerConnection-insertable-streams.html failed unexpectedly (asserts failed)

Original change's description:
> [RTCInsertableStreams] Add new tests
> 
> These tests verify that data flows normally through senders/receivers
> of one kind when the peer connection has enabled insertable streams
> for the other kind.
> 
> These tests cover the changes in
> https://chromium-review.googlesource.com/c/chromium/src/+/2139231
> 
> Bug: 1068125
> Change-Id: If00ab2cc554eae8632cb0a4fb1d010a7fe5fba3f
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2139213
> Reviewed-by: Harald Alvestrand <hta@chromium.org>
> Commit-Queue: Guido Urdaneta <guidou@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#757060}

TBR=hta@chromium.org,guidou@chromium.org

Change-Id: I70968239d8112c53bd32058acfafacf6360ec2b8
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1068125
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2140037Reviewed-by: Chris Sharp <csharp@chromium.org>
Commit-Queue: Chris Sharp <csharp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#757146}

third_party/blink/web_tests/fast/peerconnection/RTCPeerConnection-insertable-streams.html

@@ -231,60 +231,6 @@ promise_test(async t => {
   return onmessagePromise;
 }, 'RTCRtpSender readable stream transferred to a Worker and the Worker sends an RTCEncodedVideoFrame back');
 
-async function testNormalDataFlowWithInsertableStreamsForOtherKind(t, normalKind) {
-  const flowAudio = (normalKind == 'audio');
-  const pcConfig = flowAudio
-    ? {forceEncodedVideoInsertableStreams:true}
-    : {forceEncodedAudioInsertableStreams:true};
-  const caller = new RTCPeerConnection(pcConfig);
-  t.add_cleanup(() => caller.close());
-  const callee = new RTCPeerConnection(pcConfig);
-  t.add_cleanup(() => callee.close());
-
-  const stream = await navigator.mediaDevices.getUserMedia(
-    {audio: flowAudio, video: !flowAudio});
-  const track = stream.getTracks()[0];
-  t.add_cleanup(() => track.stop());
-
-  const sender = caller.addTrack(track, stream);
-  const ontrackPromise = new Promise((resolve,reject) => {
-    callee.ontrack =  t.step_func(async e => {
-      let numGetStats = 0;
-      const intervalId = window.setInterval(async ()=> {
-        let statsReport = await callee.getStats();
-        statsReport.forEach(report => {
-          if (report.type == 'inbound-rtp' &&
-              report.kind == normalKind &&
-              report.bytesReceived > 0) {
-            clearInterval(intervalId);
-            resolve();
-            return;
-          }
-        });
-        if (++numGetStats >= 3) {
-          clearInterval(intervalId);
-          reject('No bytes received.');
-          return;
-        }
-      }, 50);
-    });
-  });
-
-
-  exchangeIceCandidates(caller, callee);
-  await doSignalingHandshake(caller, callee);
-
-  return ontrackPromise;
-}
-
-promise_test(t => {
-  return testNormalDataFlowWithInsertableStreamsForOtherKind(t, 'audio');
-}, 'Audio flows when insertable streams is enabled for video and disabled for audio.');
-
-promise_test(t => {
-  return testNormalDataFlowWithInsertableStreamsForOtherKind(t, 'video');
-}, 'Video flows when insertable streams is enabled for audio and disabled for audio.');
-
 </script>
 </body>
 </html>