[M90-LTS] serial: Fix parent class tracing for SerialPort

When SerialPort was updated to be ActiveScriptWrappable and an
EventTarget the Trace method was not updated to call the parent class
trace methods.

(cherry picked from commit 4059ecc)

Bug: 1220078
Change-Id: If6967a913268bce86d4488359a9418a814530f84
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2965255
Auto-Submit: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#893039}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3041456
Reviewed-by: Jana Grill <janagrill@google.com>
Owners-Override: Jana Grill <janagrill@google.com>
Commit-Queue: Roger Felipe Zanoni da Silva <rzanoni@google.com>
Cr-Commit-Position: refs/branch-heads/4430@{#1541}
Cr-Branched-From: e5ce7dc-refs/heads/master@{#857950}

third_party/blink/renderer/modules/serial/serial_port.cc

@@ -508,7 +508,8 @@ void SerialPort::Trace(Visitor* visitor) const {
   visitor->Trace(open_resolver_);
   visitor->Trace(signal_resolvers_);
   visitor->Trace(close_resolver_);
-  ScriptWrappable::Trace(visitor);
+  EventTargetWithInlineData::Trace(visitor);
+  ActiveScriptWrappable<SerialPort>::Trace(visitor);
 }
 
 bool SerialPort::HasPendingActivity() const {