Update from https://crrev.com/329939

base/trace_event/trace_event_etw_export_win.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/trace_event/trace_event_etw_export_win.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/memory/singleton.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 88 matching lines @@
 }
 
 // static
 TraceEventETWExport* TraceEventETWExport::GetInstance() {
   return Singleton<TraceEventETWExport,
                    StaticMemorySingletonTraits<TraceEventETWExport>>::get();
 }
 
 // static
 void TraceEventETWExport::EnableETWExport() {
-  GetInstance()->ETWExportEnabled_ = true;
+  if (GetInstance())
+    GetInstance()->ETWExportEnabled_ = true;
 }
 
 // static
 void TraceEventETWExport::DisableETWExport() {
-  GetInstance()->ETWExportEnabled_ = false;
+  if (GetInstance())
+    GetInstance()->ETWExportEnabled_ = false;
 }
 
 // static
 void TraceEventETWExport::AddEvent(
     char phase,
     const unsigned char* category_group_enabled,
     const char* name,
     unsigned long long id,
     int num_args,
     const char** arg_names,
     const unsigned char* arg_types,
     const unsigned long long* arg_values,
     const scoped_refptr<ConvertableToTraceFormat>* convertable_values) {
   // We bail early in case exporting is disabled or no consumer is listening.
-  if (!GetInstance()->ETWExportEnabled_ || !EventEnabledChromeEvent())
+  if (!GetInstance() || !GetInstance()->ETWExportEnabled_ ||
+      !EventEnabledChromeEvent())
     return;
 
   std::string phase_string;
   switch (phase) {
     case TRACE_EVENT_PHASE_BEGIN:
       phase_string = "Begin";
       break;
     case TRACE_EVENT_PHASE_END:
       phase_string = "End";
       break;
@@ skipping 77 matching lines @@
 
 // static
 void TraceEventETWExport::AddCustomEvent(const char* name,
                                          char const* phase,
                                          const char* arg_name_1,
                                          const char* arg_value_1,
                                          const char* arg_name_2,
                                          const char* arg_value_2,
                                          const char* arg_name_3,
                                          const char* arg_value_3) {
-  if (!GetInstance()->ETWExportEnabled_ || !EventEnabledChromeEvent())
+  if (!GetInstance() || !GetInstance()->ETWExportEnabled_ ||
+      !EventEnabledChromeEvent())
     return;
 
   EventWriteChromeEvent(name, phase, arg_name_1, arg_value_1, arg_name_2,
                         arg_value_2, arg_name_3, arg_value_3);
 }
 
 void TraceEventETWExport::Resurrect() {
   StaticMemorySingletonTraits<TraceEventETWExport>::Resurrect();
 }
 
 }  // namespace trace_event
 }  // namespace base