Disable some Opus tests pending an update

These tests will be reenabled and updated after Opus has been updated in
Chromium and rolled into WebRTC.

BUG=737323, webrtc:8024

Review-Url: https://codereview.webrtc.org/2963673002
Cr-Commit-Position: refs/heads/master@{#19118}
diff --git a/webrtc/modules/audio_coding/neteq/neteq_unittest.cc b/webrtc/modules/audio_coding/neteq/neteq_unittest.cc
index fd163c4..26ea9ae 100644
--- a/webrtc/modules/audio_coding/neteq/neteq_unittest.cc
+++ b/webrtc/modules/audio_coding/neteq/neteq_unittest.cc
@@ -471,7 +471,7 @@
 #else
 #define MAYBE_TestOpusBitExactness DISABLED_TestOpusBitExactness
 #endif
-TEST_F(NetEqDecodingTest, MAYBE_TestOpusBitExactness) {
+TEST_F(NetEqDecodingTest, DISABLED_TestOpusBitExactness) {
   const std::string input_rtp_file =
       webrtc::test::ResourcePath("audio_coding/neteq_opus", "rtp");