Re-enabling RTCRtpReceiver-getParameters wpt.

Updated expected failure message based on rolled in webrtc change
that now enables calling addTransceiver with multiple send encodings.

Bug: webrtc:10075
Change-Id: Ia9f92aa5c41f42e996bc6c560315a2cf8b9cfe21
Reviewed-on: https://chromium-review.googlesource.com/c/1475801Reviewed-by: Steve Anton <steveanton@chromium.org>
Commit-Queue: Amit Hilbuch <amithi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#632746}

third_party/blink/web_tests/TestExpectations

@@ -6072,7 +6072,3 @@ crbug.com/930934 [ Android ] virtual/gpu-rasterization/images/drag-image-descend
 
 # Sheriff 2019-02-13
 crbug.com/931646 [ Win7 ] http/tests/preload/meta-viewport-link-headers-imagesrcset.html [ Failure Pass ]
-
-# Temporarily disabling tests for RtpReceiver::GetParameters until new version is rolled into chromium.
-crbug.com/webrtc/10299 external/wpt/webrtc/RTCRtpReceiver-getParameters.html [ Pass Failure ]
-crbug.com/webrtc/10299 virtual/webrtc-wpt-plan-b/external/wpt/webrtc/RTCRtpReceiver-getParameters.html [ Pass Failure ]

third_party/blink/web_tests/external/wpt/webrtc/RTCRtpReceiver-getParameters-expected.txt

 This is a testharness.js-based test.
 PASS getParameters() with audio receiver
 PASS getParameters() with video receiver
-FAIL getParameters() with simulcast video receiver promise_test: Unhandled rejection with value: object "OperationError: Failed to execute 'addTransceiver' on 'RTCPeerConnection': Attempted to create an encoder with more than 1 encoding parameter."
+FAIL getParameters() with simulcast video receiver assert_greater_than: expected a number greater than 0 but got 0
 Harness: the test ran to completion.