Remove unnecessary break statement in WebTransportWriteBlockedList::IsStreamBlocked()

This is causing "unreachable-code-break" compile error in Chromium build.

PiperOrigin-RevId: 633757600

quiche/quic/core/web_transport_write_blocked_list.cc

diff --git a/quiche/quic/core/web_transport_write_blocked_list.cc b/quiche/quic/core/web_transport_write_blocked_list.cc
index 0e526d8..8eb07bf 100644
--- a/quiche/quic/core/web_transport_write_blocked_list.cc
+++ b/quiche/quic/core/web_transport_write_blocked_list.cc
@@ -232,7 +232,6 @@
   switch (priority.type()) {
     case QuicPriorityType::kHttp:
       return main_schedule_.IsScheduled(ScheduleKey::HttpStream(stream_id));
-      break;
     case QuicPriorityType::kWebTransport:
       auto it = web_transport_session_schedulers_.find(
           ScheduleKey::WebTransportSession(priority));