Remove use of RtpHeaderExtension and clean up

webrtc/media/engine/webrtcmediaengine.h

Index: webrtc/media/engine/webrtcmediaengine.h
diff --git a/webrtc/media/engine/webrtcmediaengine.h b/webrtc/media/engine/webrtcmediaengine.h
index 19b7d222f2ea9c548b160e6fc2b7baac31c5fed6..8aad94ccdf8a697337ecff636d622afeb3a3a030 100644
--- a/webrtc/media/engine/webrtcmediaengine.h
+++ b/webrtc/media/engine/webrtcmediaengine.h
@@ -37,14 +37,13 @@ class WebRtcMediaEngineFactory {
 
 // Verify that extension IDs are within 1-byte extension range and are not
 // overlapping.
-bool ValidateRtpExtensions(const std::vector<RtpHeaderExtension>& extensions);
+bool ValidateRtpExtensions(const std::vector<webrtc::RtpExtension>& extensions);
 
-// Convert cricket::RtpHeaderExtension:s to webrtc::RtpExtension:s, discarding
-// any extensions not validated by the 'supported' predicate. Duplicate
+// Discard any extensions not validated by the 'supported' predicate. Duplicate
 // extensions are removed if 'filter_redundant_extensions' is set, and also any
-// mutually exclusive extensions (see implementation for details).
+// mutually exclusive extensions (see implementation for details) are removed.
 std::vector<webrtc::RtpExtension> FilterRtpExtensions(
-    const std::vector<RtpHeaderExtension>& extensions,
+    const std::vector<webrtc::RtpExtension>& extensions,
     bool (*supported)(const std::string&),
     bool filter_redundant_extensions);