tracing: simplify lifetime of TraceEventFilter(s)

base/trace_event/trace_config.cc

Index: base/trace_event/trace_config.cc
diff --git a/base/trace_event/trace_config.cc b/base/trace_event/trace_config.cc
index 9891ab62049d8ede499bda5757df1740688118f2..b7520e184fa90ce918f80ae025a951da75a13f6f 100644
--- a/base/trace_event/trace_config.cc
+++ b/base/trace_event/trace_config.cc
@@ -207,6 +207,11 @@ bool TraceConfig::EventFilterConfig::IsCategoryGroupEnabled(
   return false;
 }
 
+bool TraceConfig::EventFilterConfig::IsEnabledForCategory(
+    const char* category_name) const {
+  return IsCategoryGroupEnabled(category_name);
+}
+
 TraceConfig::TraceConfig() {
   InitializeDefault();
 }