Make CodecType conversion functions non-optional.

webrtc/sdk/android/src/jni/videodecoderfactorywrapper.cc

 /*
  *  Copyright 2017 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 12 matching lines @@
   jclass decoder_factory_class = jni->GetObjectClass(*decoder_factory_);
   create_decoder_method_ =
       jni->GetMethodID(decoder_factory_class, "createDecoder",
                        "(Ljava/lang/String;)Lorg/webrtc/VideoDecoder;");
 }
 
 webrtc::VideoDecoder* VideoDecoderFactoryWrapper::CreateVideoDecoder(
     webrtc::VideoCodecType type) {
   JNIEnv* jni = AttachCurrentThreadIfNeeded();
   ScopedLocalRefFrame local_ref_frame(jni);
-  rtc::Optional<const char*> type_payload =
-      webrtc::CodecTypeToPayloadName(type);
-  RTC_DCHECK(type_payload);
-  jstring name = jni->NewStringUTF(*type_payload);
+  const char* type_payload = webrtc::CodecTypeToPayloadString(type);
+  jstring name = jni->NewStringUTF(type_payload);
   jobject decoder =
       jni->CallObjectMethod(*decoder_factory_, create_decoder_method_, name);
   return decoder != nullptr ? new VideoDecoderWrapper(jni, decoder) : nullptr;
 }
 
 void VideoDecoderFactoryWrapper::DestroyVideoDecoder(
     webrtc::VideoDecoder* decoder) {
   delete decoder;
 }
 
 }  // namespace webrtc_jni