Update from https://crrev.com/329939

base/trace_event/trace_event_etw_export_win.h

Index: base/trace_event/trace_event_etw_export_win.h
diff --git a/base/trace_event/trace_event_etw_export_win.h b/base/trace_event/trace_event_etw_export_win.h
index 0a551c3cf0fde5eee541ef61cdb77642201d3276..eefe820481217ceb8f32f9f30a6b005f2628f07b 100644
--- a/base/trace_event/trace_event_etw_export_win.h
+++ b/base/trace_event/trace_event_etw_export_win.h
@@ -3,8 +3,8 @@
 // found in the LICENSE file.
 
 // This file contains the Windows-specific exporting to ETW.
-#ifndef BASE_TRACE_EVENT_TRACE_ETW_EXPORT_H_
-#define BASE_TRACE_EVENT_TRACE_ETW_EXPORT_H_
+#ifndef BASE_TRACE_EVENT_TRACE_EVENT_ETW_EXPORT_WIN_H_
+#define BASE_TRACE_EVENT_TRACE_EVENT_ETW_EXPORT_WIN_H_
 
 #include "base/base_export.h"
 #include "base/trace_event/trace_event_impl.h"
@@ -29,7 +29,9 @@ class BASE_EXPORT TraceEventETWExport {
   static void EnableETWExport();
   static void DisableETWExport();
 
-  static bool isETWExportEnabled() { return GetInstance()->ETWExportEnabled_; }
+  static bool isETWExportEnabled() {
+    return (GetInstance() && GetInstance()->ETWExportEnabled_);
+  }
 
   // Exports an event to ETW. This is mainly used in
   // TraceLog::AddTraceEventWithThreadIdAndTimestamp to export internal events.
@@ -70,4 +72,4 @@ class BASE_EXPORT TraceEventETWExport {
 }  // namespace trace_event
 }  // namespace base
 
-#endif  // BASE_TRACE_EVENT_TRACE_ETW_EXPORT_H_
+#endif  // BASE_TRACE_EVENT_TRACE_EVENT_ETW_EXPORT_WIN_H_