- Filter data channel codecs based on codec name instead of payload type, which may have been remapped.
- Rename the data codec payload types to end with "PlType" instead of "Id", for consistency.

BUG=webrtc:2795

Review-Url: https://codereview.webrtc.org/2397413002
Cr-Commit-Position: refs/heads/master@{#14581}
diff --git a/webrtc/api/webrtcsdp_unittest.cc b/webrtc/api/webrtcsdp_unittest.cc
index 1672268..2faec7e 100644
--- a/webrtc/api/webrtcsdp_unittest.cc
+++ b/webrtc/api/webrtcsdp_unittest.cc
@@ -1395,7 +1395,7 @@
     std::unique_ptr<DataContentDescription> data(new DataContentDescription());
     data_desc_ = data.get();
     data_desc_->set_protocol(cricket::kMediaProtocolDtlsSctp);
-    DataCodec codec(cricket::kGoogleSctpDataCodecId,
+    DataCodec codec(cricket::kGoogleSctpDataCodecPlType,
                     cricket::kGoogleSctpDataCodecName);
     codec.SetParam(cricket::kCodecParamPort, kDefaultSctpPort);
     data_desc_->AddCodec(codec);
@@ -1990,7 +1990,7 @@
       jsep_desc.description()->GetContentDescriptionByName(kDataContentName));
 
   const int kNewPort = 1234;
-  cricket::DataCodec codec(cricket::kGoogleSctpDataCodecId,
+  cricket::DataCodec codec(cricket::kGoogleSctpDataCodecPlType,
                            cricket::kGoogleSctpDataCodecName);
   codec.SetParam(cricket::kCodecParamPort, kNewPort);
   dcdesc->AddOrReplaceCodec(codec);
@@ -2605,7 +2605,7 @@
       mutant->GetContentDescriptionByName(kDataContentName));
   std::vector<cricket::DataCodec> codecs(dcdesc->codecs());
   EXPECT_EQ(1U, codecs.size());
-  EXPECT_EQ(cricket::kGoogleSctpDataCodecId, codecs[0].id);
+  EXPECT_EQ(cricket::kGoogleSctpDataCodecPlType, codecs[0].id);
   codecs[0].SetParam(cricket::kCodecParamPort, kUnusualSctpPort);
   dcdesc->set_codecs(codecs);