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

trace_event/trace_log.cc

Index: trace_event/trace_log.cc
diff --git a/trace_event/trace_log.cc b/trace_event/trace_log.cc
index aebb5e44375d86f1a7261aadb6cf991899480758..2822c3742f51b70752589ef573a6da9fd8fe2be9 100644
--- a/trace_event/trace_log.cc
+++ b/trace_event/trace_log.cc
@@ -1662,9 +1662,9 @@ void TraceLog::UpdateETWCategoryGroupEnabledFlags() {
     DCHECK(category_group);
     if (base::trace_event::TraceEventETWExport::IsCategoryGroupEnabled(
             category_group)) {
-      g_category_group_enabled[category_index] |= ENABLED_FOR_ETW_EXPORT;
+      g_category_group_enabled[i] |= ENABLED_FOR_ETW_EXPORT;
     } else {
-      g_category_group_enabled[category_index] &= ~ENABLED_FOR_ETW_EXPORT;
+      g_category_group_enabled[i] &= ~ENABLED_FOR_ETW_EXPORT;
     }
   }
 }