[tracing] Fix namespace for TRACE_ID_WITH_SCOPE().

Inside V8 the TraceID class sits in v8::internal::tracing instead of
trace_event_internal namespace (as in Chrome).

Bug: v8:8834
Change-Id: I9464e6145c4fd4c794ac3f50052a5fa1b068aeed
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1535834
Auto-Submit: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60421}

src/tracing/trace-event.h

@@ -47,7 +47,7 @@ enum CategoryGroupEnabledFlags {
 // By default, trace IDs are eventually converted to a single 64-bit number. Use
 // this macro to add a scope string.
 #define TRACE_ID_WITH_SCOPE(scope, id) \
-  trace_event_internal::TraceID::WithScope(scope, id)
+  v8::internal::tracing::TraceID::WithScope(scope, id)
 
 #define INTERNAL_TRACE_EVENT_CATEGORY_GROUP_ENABLED_FOR_RECORDING_MODE() \
   TRACE_EVENT_API_LOAD_CATEGORY_GROUP_ENABLED() &                        \