Removes an error log for an event generated by the wrapper API.

Resolves https://github.com/envoyproxy/envoy/issues/19544

PiperOrigin-RevId: 421681654

http2/adapter/callback_visitor.cc

diff --git a/http2/adapter/callback_visitor.cc b/http2/adapter/callback_visitor.cc
index dcdca64..4b2f078 100644
--- a/http2/adapter/callback_visitor.cc
+++ b/http2/adapter/callback_visitor.cc
@@ -69,7 +69,7 @@
 }
 
 void CallbackVisitor::OnConnectionError(ConnectionError /*error*/) {
-  QUICHE_LOG(ERROR) << "OnConnectionError not implemented";
+  QUICHE_VLOG(1) << "OnConnectionError not implemented";
 }
 
 bool CallbackVisitor::OnFrameHeader(Http2StreamId stream_id, size_t length,