Register header extensions in RtpRtcpObserver to avoid log spam.

webrtc/test/constants.cc

Index: webrtc/test/constants.cc
diff --git a/webrtc/modules/audio_device/android/ensure_initialized.h b/webrtc/test/constants.cc
similarity index 69%
copy from webrtc/modules/audio_device/android/ensure_initialized.h
copy to webrtc/test/constants.cc
index c1997b4acdf1484a41bffef16f66809e49fa6e90..7e94fe58fb78eeefc395f84be07180df0331243f 100644
--- a/webrtc/modules/audio_device/android/ensure_initialized.h
+++ b/webrtc/test/constants.cc
@@ -8,10 +8,13 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-namespace webrtc {
-namespace audiodevicemodule {
+#include "webrtc/test/constants.h"
 
-void EnsureInitialized();
+namespace webrtc {
+namespace test {
 
-}  // namespace audiodevicemodule
+const int kTOffsetExtensionId = 6;
+const int kAbsSendTimeExtensionId = 7;
+const int kTransportSequenceNumberExtensionId = 8;
+}  // namespace test
 }  // namespace webrtc