tracing: simplify lifetime of TraceEventFilter(s)

base/trace_event/trace_config.cc

 // Copyright (c) 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/trace_event/trace_config.h"
 
 #include <stddef.h>
 
 #include <utility>
 
@@ skipping 189 matching lines @@
     for (const auto& included_category : included_categories_) {
       if (base::MatchPattern(category_group_token, included_category)) {
         return true;
       }
     }
   }
 
   return false;
 }
 
+bool TraceConfig::EventFilterConfig::IsEnabledForCategory(
+    const char* category_name) const {
+  return IsCategoryGroupEnabled(category_name);
+}
+
 TraceConfig::TraceConfig() {
   InitializeDefault();
 }
 
 TraceConfig::TraceConfig(StringPiece category_filter_string,
                          StringPiece trace_options_string) {
   InitializeFromStrings(category_filter_string, trace_options_string);
 }
 
 TraceConfig::TraceConfig(StringPiece category_filter_string,
@@ skipping 643 matching lines @@
     StringPiece str) {
   return str.empty() || str.front() == ' ' || str.back() == ' ';
 }
 
 bool TraceConfig::HasIncludedPatterns() const {
   return !included_categories_.empty();
 }
 
 }  // namespace trace_event
 }  // namespace base