tracing: simplify lifetime of TraceEventFilter(s)

base/trace_event/trace_config.h

Index: base/trace_event/trace_config.h
diff --git a/base/trace_event/trace_config.h b/base/trace_event/trace_config.h
index 7db09fca79bc28fdd2af5fd1ed01954a6a8c5cdf..52286024cf7553d8a0ce4644df44411553de47a4 100644
--- a/base/trace_event/trace_config.h
+++ b/base/trace_event/trace_config.h
@@ -17,6 +17,7 @@
 #include "base/gtest_prod_util.h"
 #include "base/strings/string_piece.h"
 #include "base/trace_event/memory_dump_request_args.h"
+#include "base/trace_event/trace_event_filter.h"
 #include "base/values.h"
 
 namespace base {
@@ -84,12 +85,12 @@ class BASE_EXPORT TraceConfig {
     HeapProfiler heap_profiler_options;
   };
 
-  class EventFilterConfig {
+  class EventFilterConfig : public TraceEventFilter::Config {
    public:
     EventFilterConfig(const std::string& predicate_name);
     EventFilterConfig(const EventFilterConfig& tc);
 
-    ~EventFilterConfig();
+    ~EventFilterConfig() override;
 
     EventFilterConfig& operator=(const EventFilterConfig& rhs);
 
@@ -109,6 +110,9 @@ class BASE_EXPORT TraceConfig {
       return excluded_categories_;
     }
 
+    // TraceEventFilter::CategoryConfig implementation.
+    bool IsEnabledForCategory(const char* category_name) const override;
+
    private:
     std::string predicate_name_;
     StringList included_categories_;