Switch to standard integer types in chrome/browser/, part 4 of 4.

chrome/browser/signin/signin_tracker_factory.h

 // Copyright 2014 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_SIGNIN_SIGNIN_TRACKER_FACTORY_H_
 #define CHROME_BROWSER_SIGNIN_SIGNIN_TRACKER_FACTORY_H_
 
+#include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "components/signin/core/browser/signin_tracker.h"
 
 class Profile;
 
 class SigninTrackerFactory {
  public:
   virtual ~SigninTrackerFactory();
 
   // Creates a SigninTracker instance that tracks signin for |profile| on
   // behalf of |observer|.
   static scoped_ptr<SigninTracker> CreateForProfile(
       Profile* profile,
       SigninTracker::Observer* observer);
 
  private:
   SigninTrackerFactory();
 
   DISALLOW_COPY_AND_ASSIGN(SigninTrackerFactory);
 };
 
 #endif  // CHROME_BROWSER_SIGNIN_SIGNIN_TRACKER_FACTORY_H_