WebRtcVideoEncoderFactory cleanup

Remove some deprecated functions.

BUG=webrtc:6402

Review-Url: https://codereview.webrtc.org/2859223003
Cr-Commit-Position: refs/heads/master@{#18116}
diff --git a/webrtc/media/engine/webrtcvideoencoderfactory_unittest.cc b/webrtc/media/engine/webrtcvideoencoderfactory_unittest.cc
index 967c33b..5d3c9ab 100644
--- a/webrtc/media/engine/webrtcvideoencoderfactory_unittest.cc
+++ b/webrtc/media/engine/webrtcvideoencoderfactory_unittest.cc
@@ -16,15 +16,22 @@
     : public cricket::WebRtcVideoEncoderFactory {
  public:
   WebRtcVideoEncoderFactoryForTest() {
-    codecs_.push_back(VideoCodec(webrtc::kVideoCodecH264, "H264"));
-    codecs_.push_back(VideoCodec(webrtc::kVideoCodecVP8, "VP8"));
+    codecs_.push_back(cricket::VideoCodec("H264"));
+    codecs_.push_back(cricket::VideoCodec("VP8"));
   }
 
-  const std::vector<VideoCodec>& codecs() const override { return codecs_; }
+  webrtc::VideoEncoder* CreateVideoEncoder(
+      const cricket::VideoCodec& codec) override {
+    return nullptr;
+  }
+
+  const std::vector<cricket::VideoCodec>& supported_codecs() const override {
+    return codecs_;
+  }
 
   void DestroyVideoEncoder(webrtc::VideoEncoder* encoder) override {}
 
-  std::vector<VideoCodec> codecs_;
+  std::vector<cricket::VideoCodec> codecs_;
 };
 
 TEST(WebRtcVideoEncoderFactoryTest, TestMultipleCallsToSupportedCodecs) {