Fix experiment name in BitrateControllerTest.

TBR=mflodman@webrtc.org
BUG=webrtc:6519

Review URL: https://codereview.webrtc.org/2414913002 .

Cr-Commit-Position: refs/heads/master@{#14620}
diff --git a/webrtc/modules/bitrate_controller/bitrate_controller_unittest.cc b/webrtc/modules/bitrate_controller/bitrate_controller_unittest.cc
index 6f269a4..0e080ee 100644
--- a/webrtc/modules/bitrate_controller/bitrate_controller_unittest.cc
+++ b/webrtc/modules/bitrate_controller/bitrate_controller_unittest.cc
@@ -412,7 +412,7 @@
 TEST_F(BitrateControllerTest, TimeoutsWithoutFeedback) {
   {
     webrtc::test::ScopedFieldTrials override_field_trials(
-        "WebRTC-SendSideBwe/Enabled/");
+        "WebRTC-FeedbackTimeout/Enabled/");
     SetUp();
     int expected_bitrate_bps = 300000;
     controller_->SetBitrates(300000, kDefaultMinBitrateBps,