Add INSTANTIATE_TEST_SUITE_P as needed.

So that we don't receive an error on extended test class which is never instantiated with TEST_P or TYPED_TEST_P

Bug: b/139702016
Change-Id: Ie0c5fc3307589fa296eb7c574a994e8662fa2ccd
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/175659
Reviewed-by: Artem Titov <titovartem@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Sam Zackrisson <saza@webrtc.org>
Commit-Queue: Courtney Edwards <courtneyfe@chromium.org>
Cr-Commit-Position: refs/heads/master@{#31353}

media/engine/webrtc_voice_engine_unittest.cc

diff --git a/media/engine/webrtc_voice_engine_unittest.cc b/media/engine/webrtc_voice_engine_unittest.cc
index e7ebf89..b694046 100644
--- a/media/engine/webrtc_voice_engine_unittest.cc
+++ b/media/engine/webrtc_voice_engine_unittest.cc
@@ -2046,6 +2046,10 @@
       : WebRtcVoiceEngineTestFake("WebRTC-Audio-SendSideBwe/Enabled/") {}
 };
 
+INSTANTIATE_TEST_SUITE_P(UnusedParameter,
+                         WebRtcVoiceEngineWithSendSideBweTest,
+                         ::testing::Values(true));
+
 TEST_P(WebRtcVoiceEngineWithSendSideBweTest,
        SupportsTransportSequenceNumberHeaderExtension) {
   const std::vector<webrtc::RtpExtension> header_extensions =