Require explicit selection of traits for LazyInstance

chrome/browser/chromeos/printing/printers_manager_factory.h

 // Copyright 2016 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 CHROME_BROWSER_CHROMEOS_PRINTING_PRINTERS_MANAGER_FACTORY_H_
 #define CHROME_BROWSER_CHROMEOS_PRINTING_PRINTERS_MANAGER_FACTORY_H_
 
 #include "base/lazy_instance.h"
 #include "base/macros.h"
 #include "chrome/browser/chromeos/printing/printers_manager.h"
@@ skipping 10 matching lines @@
   static PrintersManager* GetForBrowserContext(
       content::BrowserContext* context);
 
   static PrintersManagerFactory* GetInstance();
 
  protected:
   content::BrowserContext* GetBrowserContextToUse(
       content::BrowserContext* context) const override;
 
  private:
-  friend struct base::DefaultLazyInstanceTraits<PrintersManagerFactory>;
+  friend struct base::LazyInstanceTraitsBase<PrintersManagerFactory>;
 
   PrintersManagerFactory();
   ~PrintersManagerFactory() override;
 
   // BrowserContextKeyedServiceFactory implementation:
   PrintersManager* BuildServiceInstanceFor(
       content::BrowserContext* browser_context) const override;
 
   DISALLOW_COPY_AND_ASSIGN(PrintersManagerFactory);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_PRINTING_PRINTERS_MANAGER_FACTORY_H_