tracing: split trace event filter classes out of TraceLog

base/trace_event/trace_log.h

Index: base/trace_event/trace_log.h
diff --git a/base/trace_event/trace_log.h b/base/trace_event/trace_log.h
index 68a7fbbcb1751a54ee590f2e031b4db60b44b672..c86675177fe7000891be12632c63ed6c87f8bc92 100644
--- a/base/trace_event/trace_log.h
+++ b/base/trace_event/trace_log.h
@@ -281,24 +281,6 @@ class BASE_EXPORT TraceLog : public MemoryDumpProvider {
   // Allows deleting our singleton instance.
   static void DeleteForTesting();
 
-  class BASE_EXPORT TraceEventFilter {
-   public:
-    static const char* const kEventWhitelistPredicate;
-    static const char* const kHeapProfilerPredicate;
-
-    TraceEventFilter() {}
-    virtual ~TraceEventFilter() {}
-    virtual bool FilterTraceEvent(const TraceEvent& trace_event) const = 0;
-    virtual void EndEvent(const char* category_group, const char* name) {}
-
-   private:
-    DISALLOW_COPY_AND_ASSIGN(TraceEventFilter);
-  };
-  typedef std::unique_ptr<TraceEventFilter> (
-      *TraceEventFilterConstructorForTesting)(void);
-  static void SetTraceEventFilterConstructorForTesting(
-      TraceEventFilterConstructorForTesting predicate);
-
   // Allow tests to inspect TraceEvents.
   TraceEvent* GetEventByHandle(TraceEventHandle handle);