tracing: split trace event filter classes out of TraceLog

base/trace_event/trace_log_constants.cc

Index: base/trace_event/trace_log_constants.cc
diff --git a/base/trace_event/trace_log_constants.cc b/base/trace_event/trace_log_constants.cc
index b72ca1b3b4ae4bcd9bba83781825ce43ebca46ef..65dca2e4d6f94807baa5ff19ae4ab6063caa82b0 100644
--- a/base/trace_event/trace_log_constants.cc
+++ b/base/trace_event/trace_log_constants.cc
@@ -22,11 +22,5 @@ const TraceLog::InternalTraceOptions
 const TraceLog::InternalTraceOptions
     TraceLog::kInternalEnableArgumentFilter = 1 << 5;
 
-// TraceEventFilter predicate names used in trace config.
-const char* const TraceLog::TraceEventFilter::kEventWhitelistPredicate =
-    "event_whitelist_predicate";
-const char* const TraceLog::TraceEventFilter::kHeapProfilerPredicate =
-    "heap_profiler_predicate";
-
 }  // namespace trace_event
 }  // namespace base