Update to Chromium //base at Chromium commit 3e81715e6d3a4324362635aea46ce1f1a163cca1.

trace_event/trace_event_etw_export_win.h

Index: trace_event/trace_event_etw_export_win.h
diff --git a/trace_event/trace_event_etw_export_win.h b/trace_event/trace_event_etw_export_win.h
index 523c44b1d1da7a649a46bdf8768c2cfa67908ffa..c1eafffa3a69ece14852aa1a18ff5ef4931b236d 100644
--- a/trace_event/trace_event_etw_export_win.h
+++ b/trace_event/trace_event_etw_export_win.h
@@ -16,10 +16,6 @@
 template <typename Type>
 struct StaticMemorySingletonTraits;
 
-namespace {
-class ETWKeywordUpdateThread;
-}
-
 namespace base {
 namespace trace_event {
 
@@ -72,7 +68,7 @@ class BASE_EXPORT TraceEventETWExport {
   // Ensure only the provider can construct us.
   friend struct StaticMemorySingletonTraits<TraceEventETWExport>;
   // To have access to UpdateKeyword().
-  friend class ETWKeywordUpdateThread;
+  class ETWKeywordUpdateThread;
   TraceEventETWExport();
 
   // Updates the list of enabled categories by consulting the ETW keyword.