Revert of Remove deprecated CodecType methods.

webrtc/common_types.cc

Index: webrtc/common_types.cc
diff --git a/webrtc/common_types.cc b/webrtc/common_types.cc
index 6cf7304ad83cce8f3ceaa7f91064e837f7378d39..82307ce52b37393837d79bde3938ba101ab60c0c 100644
--- a/webrtc/common_types.cc
+++ b/webrtc/common_types.cc
@@ -168,6 +168,16 @@
   return kVideoCodecGeneric;
 }
 
+// TODO(kthelgason): Remove these methods once upstream projects
+// have been updated.
+rtc::Optional<const char*> CodecTypeToPayloadName(VideoCodecType type) {
+  return rtc::Optional<const char*>(CodecTypeToPayloadString(type));
+}
+
+rtc::Optional<VideoCodecType> PayloadNameToCodecType(const std::string& name) {
+  return rtc::Optional<VideoCodecType>(PayloadStringToCodecType(name));
+}
+
 const uint32_t BitrateAllocation::kMaxBitrateBps =
     std::numeric_limits<uint32_t>::max();