Fix faulty include paths that break the build

BUG=none
R=stefan@webrtc.org

Review URL: https://codereview.webrtc.org/2380013002 .

Cr-Commit-Position: refs/heads/master@{#14434}
diff --git a/webrtc/modules/remote_bitrate_estimator/transport_feedback_adapter_unittest.cc b/webrtc/modules/remote_bitrate_estimator/transport_feedback_adapter_unittest.cc
index e2755b3..b312f96 100644
--- a/webrtc/modules/remote_bitrate_estimator/transport_feedback_adapter_unittest.cc
+++ b/webrtc/modules/remote_bitrate_estimator/transport_feedback_adapter_unittest.cc
@@ -12,8 +12,8 @@
 #include <memory>
 #include <vector>
 
-#include "testing/gmock/include/gmock/gmock.h"
-#include "testing/gtest/include/gtest/gtest.h"
+#include "webrtc/test/gmock.h"
+#include "webrtc/test/gtest.h"
 
 #include "webrtc/base/checks.h"
 #include "webrtc/modules/bitrate_controller/include/mock/mock_bitrate_controller.h"