Revert of Remove deprecated CodecType methods.

webrtc/common_types.h

Index: webrtc/common_types.h
diff --git a/webrtc/common_types.h b/webrtc/common_types.h
index 843d9b858468443abf2879940582e3cc87cee96e..c4b5ce8e70ee27b581cd302befc83353b633457a 100644
--- a/webrtc/common_types.h
+++ b/webrtc/common_types.h
@@ -550,6 +550,10 @@
 // Translates from name of codec to codec type and vice versa.
 const char* CodecTypeToPayloadString(VideoCodecType type);
 VideoCodecType PayloadStringToCodecType(const std::string& name);
+// TODO(kthelgason): Remove these methods once upstream projects
+// have been updated.
+rtc::Optional<const char*> CodecTypeToPayloadName(VideoCodecType type);
+rtc::Optional<VideoCodecType> PayloadNameToCodecType(const std::string& name);
 
 union VideoCodecUnion {
   VideoCodecVP8 VP8;