message: Fix FrameBuffer3 trial video_receive_stream2 tests
  Cr-Commit-Position: refs/heads/main@{#36048}
diff: @@ -80,7 +80,7 @@ class VideoReceiveStream2Test : public ::testing::Test {
  h264_decoder_factory_(&mock_h264_video_decoder_),
  config_(&mock_transport_, &h264_decoder_factory_),
  call_stats_(Clock::GetRealTimeClock(), loop_.task_queue()),
  - field_trials_("WebRTC-FrameBuffer3/Enabled/") {}
  + field_trials_("WebRTC-FrameBuffer3/arm:FrameBuffer3/") {}
  ~VideoReceiveStream2Test() override {
  if (video_receive_stream_)
  video_receive_stream_->UnregisterFromTransport();
  @@ -539,8 +539,8 @@ class VideoReceiveStream2TestWithSimulatedClock
  VideoReceiveStream2TestWithSimulatedClock()
  : time_controller_(Timestamp::Millis(4711)),
  field_trials_(std::get<1>(GetParam())
  - ? "WebRTC-FrameBuffer3/Enabled/"
  - : "WebRTC-FrameBuffer3/Disabled/"),
  + ? "WebRTC-FrameBuffer3/arm:FrameBuffer3/"
  + : "WebRTC-FrameBuffer3/arm:FrameBuffer2/"),
  fake_decoder_factory_([this] {
  return std::make_unique<FakeDecoder2>([this] { OnFrameDecoded(); });
  }),
  