[ETW] Fix wrong index in UpdateETWCategoryGroupEnabledFlags resulting in overflow.

base/trace_event/trace_log.cc

Index: base/trace_event/trace_log.cc
diff --git a/base/trace_event/trace_log.cc b/base/trace_event/trace_log.cc
index af2124efd007c1f17b7279190ec7482244ebc869..f6c9115646314f6ca7e3e048fa1fda56148d30cd 100644
--- a/base/trace_event/trace_log.cc
+++ b/base/trace_event/trace_log.cc
@@ -1718,9 +1718,9 @@ 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;
     }
   }
 }