Provide move semantic for cricket::Codec and subclasses

webrtc/media/engine/webrtcvoiceengine_unittest.cc

Index: webrtc/media/engine/webrtcvoiceengine_unittest.cc
diff --git a/webrtc/media/engine/webrtcvoiceengine_unittest.cc b/webrtc/media/engine/webrtcvoiceengine_unittest.cc
index 6aedab2e025abbbe3b9b0f510fc55a60fe1b691b..93300e41b92a16c684fd7a762a39d9c1a7ec9afe 100644
--- a/webrtc/media/engine/webrtcvoiceengine_unittest.cc
+++ b/webrtc/media/engine/webrtcvoiceengine_unittest.cc
@@ -3411,18 +3411,10 @@ TEST(WebRtcVoiceEngineTest, HasCorrectCodecs) {
   EXPECT_TRUE(cricket::WebRtcVoiceEngine::ToCodecInst(
       cricket::AudioCodec(96, "iLBC", 8000, 0, 1), nullptr));
   EXPECT_TRUE(cricket::WebRtcVoiceEngine::ToCodecInst(
-      cricket::AudioCodec(96, "PCMU", 8000, 0, 1), nullptr));
-  EXPECT_TRUE(cricket::WebRtcVoiceEngine::ToCodecInst(
-      cricket::AudioCodec(96, "PCMA", 8000, 0, 1), nullptr));
-  EXPECT_TRUE(cricket::WebRtcVoiceEngine::ToCodecInst(
-      cricket::AudioCodec(96, "G722", 8000, 0, 1), nullptr));
-  EXPECT_TRUE(cricket::WebRtcVoiceEngine::ToCodecInst(
       cricket::AudioCodec(96, "CN", 32000, 0, 1), nullptr));
   EXPECT_TRUE(cricket::WebRtcVoiceEngine::ToCodecInst(
       cricket::AudioCodec(96, "CN", 16000, 0, 1), nullptr));
   EXPECT_TRUE(cricket::WebRtcVoiceEngine::ToCodecInst(
-      cricket::AudioCodec(96, "CN", 8000, 0, 1), nullptr));
-  EXPECT_TRUE(cricket::WebRtcVoiceEngine::ToCodecInst(
       cricket::AudioCodec(96, "telephone-event", 8000, 0, 1), nullptr));
   // Check codecs with an id by id.
   EXPECT_TRUE(cricket::WebRtcVoiceEngine::ToCodecInst(