Revert of RTCRtpReceiver.getContributingSources() added.

third_party/WebKit/LayoutTests/fast/peerconnection/RTCPeerConnection-getReceivers.html

Index: third_party/WebKit/LayoutTests/fast/peerconnection/RTCPeerConnection-getReceivers.html
diff --git a/third_party/WebKit/LayoutTests/fast/peerconnection/RTCPeerConnection-getReceivers.html b/third_party/WebKit/LayoutTests/fast/peerconnection/RTCPeerConnection-getReceivers.html
index 61b09a97b0cc40f22d507293c1f6536957468698..6bfbd5410d5faa75e9910663dd5d063457099985 100644
--- a/third_party/WebKit/LayoutTests/fast/peerconnection/RTCPeerConnection-getReceivers.html
+++ b/third_party/WebKit/LayoutTests/fast/peerconnection/RTCPeerConnection-getReceivers.html
@@ -113,88 +113,7 @@
       assert_equals(pc.getRemoteStreams().length, 0);
       assert_equals(pc.getReceivers().length, 0);
     });
-}, 'pc.getReceivers() for streams being added and removed.');
-
-// |RTCRtpReceiver::getContributingSources| is mocked to update the contributing
-// sources with a predictable pattern, see
-// |MockWebRTCRtpReceiver::getContributingSources|. This test ensures that the
-// sources are correctly cached for subsequent calls in the same event task
-// execution, that they are updated between event task execution calls and that
-// object identities of contributing sources hold.
-promise_test(function() {
-  let pc = new RTCPeerConnection();
-  let receiver = null;
-  let contributingSource0 = null;
-  return createStreams({audio:true}, 1)
-    .then(function(streams) {
-      return addRemoteStreamsFromLocalStreams(pc, streams);
-    })
-    .then(function() {
-      verifyStreamAndTrackCounts(pc.getRemoteStreams(), 1, true, false);
-      verifyRemoteTracksHaveReceivers(pc);
-
-      assert_equals(pc.getReceivers().length, 1);
-      receiver = pc.getReceivers()[0];
-      verifyContributingSourcesAreCached(receiver);
-
-      let contributingSources = receiver.getContributingSources();
-      assert_equals(contributingSources.length, 1);
-      assertContributingSourceEquals(contributingSources[0], 0, 0.0);
-
-      // Remember the first contributing source for later.
-      contributingSource0 = contributingSources[0];
-      // Pass |contributingSource0| to the next "then". By resolving a promise
-      // we get an asynchronous callback, i.e. the "then" happens in the next
-      // iteration of the event loop. This should invalidate the contributing
-      // sources cache.
-      return Promise.resolve(contributingSource0);
-    }).then(function(prevContributingSource) {
-      verifyContributingSourcesAreCached(receiver);
-
-      let contributingSources = receiver.getContributingSources();
-      assert_equals(contributingSources.length, 2);
-      assertContributingSourceEquals(contributingSources[0], 0, 0.0);
-      assertContributingSourceEquals(contributingSources[1], 1, 5000.0);
-
-      // Make sure object identities are preserved between event loop task
-      // executions (between asynchronous calls and contributing sources
-      // updates).
-      assert_equals(contributingSources[0], prevContributingSource);
-
-      return Promise.resolve(contributingSources[1]);
-    }).then(function(prevContributingSource) {
-      verifyContributingSourcesAreCached(receiver);
-
-      let contributingSources = receiver.getContributingSources();
-      assert_equals(contributingSources.length, 2);
-      assert_equals(contributingSources[0], prevContributingSource);
-      assertContributingSourceEquals(contributingSources[0], 1, 5000.0);
-      assertContributingSourceEquals(contributingSources[1], 2, 10000.0);
-
-      // Make sure object identities are preserved between event loop task
-      // executions (between asynchronous calls and contributing sources
-      // updates).
-      assert_equals(contributingSources[0], prevContributingSource);
-
-      return Promise.resolve(contributingSources[1]);
-    }).then(function(prevContributingSource) {
-      verifyContributingSourcesAreCached(receiver);
-
-      // It's source 0's turn to be updated. A contributing source should be
-      // kept up-to-date in a new event loop task execution without having to
-      // explicitly call |getContributingSources|.
-      assertContributingSourceEquals(contributingSource0, 0, 15000.0);
-
-      let contributingSources = receiver.getContributingSources();
-      assert_equals(contributingSources.length, 2);
-      assertContributingSourceEquals(contributingSources[0], 2, 10000.0);
-      assertContributingSourceEquals(contributingSources[1], 0, 15000.0);
-      assert_equals(contributingSources[0], prevContributingSource);
-      assert_equals(contributingSources[1], contributingSource0);
-
-      return Promise.resolve();
-    });
-}, 'receiver.getContributingSources()');
+}, 'getReceivers() for streams being added and removed.');
 
 /**
  * Helper functions to tests.
@@ -292,26 +211,6 @@
   }
   assert_equals(receiverTracks.size, remoteTracks.size);
 }
-
-/**
- * The |MockWebRTCRtpReceiver::getContributingSources| produces a new set of
- * contributing sources every call. The |RTCRtpReceiver| has a cache to make
- * sure its |getContributingSources| does not change during the same event loop
- * task execution.
- */
-function verifyContributingSourcesAreCached(receiver) {
-  // If caching is working as intended, this is always true. It should only be
-  // able to change between asynchronous calls, e.g. |Promise.resolve().then()|.
-  // Since the mock always produces a new set of sources, this would not be true
-  // if caching was not enabled.
-  assert_array_equals(receiver.getContributingSources(),
-                      receiver.getContributingSources());
-}
-
-function assertContributingSourceEquals(contributingSource, source, timestamp) {
-  assert_equals(contributingSource.source, source);
-  assert_equals(contributingSource.timestamp, timestamp);
-}
 </script>
 </body>
 </html>