Require explicit selection of traits for LazyInstance

extensions/browser/api/system_cpu/cpu_info_provider.h

 // Copyright 2013 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.
 
 #ifndef EXTENSIONS_BROWSER_API_SYSTEM_CPU_CPU_INFO_PROVIDER_H_
 #define EXTENSIONS_BROWSER_API_SYSTEM_CPU_CPU_INFO_PROVIDER_H_
 
 #include <vector>
 
 #include "base/cpu.h"
@@ skipping 32 matching lines @@
 
   // The last information filled up by QueryInfo and is accessed on multiple
   // threads, but the whole class is being guarded by SystemInfoProvider base
   // class.
   //
   // |info_| is accessed on the UI thread while |is_waiting_for_completion_| is
   // false and on the sequenced worker pool while |is_waiting_for_completion_|
   // is true.
   api::system_cpu::CpuInfo info_;
 
-  static base::LazyInstance<scoped_refptr<CpuInfoProvider> > provider_;
+  static base::LazyInstance<scoped_refptr<CpuInfoProvider>>::DestructorAtExit
+      provider_;
   base::CPU cpu_;
 
   DISALLOW_COPY_AND_ASSIGN(CpuInfoProvider);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_SYSTEM_CPU_CPU_INFO_PROVIDER_H_