Remove unnecessary ERR_CHANNEL_ID_IMPORT_FAILED codepath.

net/quic/crypto/channel_id_chromium.cc

Index: net/quic/crypto/channel_id_chromium.cc
diff --git a/net/quic/crypto/channel_id_chromium.cc b/net/quic/crypto/channel_id_chromium.cc
index 3f50b768302f95565369a11816da0bef53620231..1aec7e7b8a0da2f782e4fb91cb1a7fb24840eaa7 100644
--- a/net/quic/crypto/channel_id_chromium.cc
+++ b/net/quic/crypto/channel_id_chromium.cc
@@ -190,14 +190,9 @@ int ChannelIDSourceChromium::Job::DoGetChannelIDKeyComplete(int result) {
     return result;
   }
 
-  if (!channel_id_crypto_key_) {
-    // TODO(wtc): use the new error code ERR_CHANNEL_ID_IMPORT_FAILED to be
-    // added in https://codereview.chromium.org/338093012/.
-    return ERR_UNEXPECTED;
-  }
+  DCHECK(channel_id_crypto_key_);
   channel_id_key_.reset(
       new ChannelIDKeyChromium(std::move(channel_id_crypto_key_)));
-
   return result;
 }