Switch to standard integer types in ios/.

ios/chrome/browser/install_time_util.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 IOS_CHROME_BROWSER_INSTALL_TIME_UTIL_H_
 #define IOS_CHROME_BROWSER_INSTALL_TIME_UTIL_H_
 
+#include <stdint.h>
+
 #include "base/time/time.h"
 
 namespace install_time_util {
 
-extern const int64 kUnknownInstallDate;
+extern const int64_t kUnknownInstallDate;
 
 // Computes the true installation time of the application based on the current
 // install time stored in NSUserDefaults and whether or not this is a first run
 // launch.  This function will return a base::Time corresponding to
 // |kUnknownInstallDate| if the true installation time is unknown.
 base::Time ComputeInstallationTime(bool is_first_run);
 
 // Internal implementation of |ComputeInstallationTime()|.  Exposed only for
 // testing.
 base::Time ComputeInstallationTimeInternal(
     bool is_first_run,
     base::Time ns_user_defaults_install_time);
 
 }  // namespace install_time_util
 
 #endif  // IOS_CHROME_BROWSER_INSTALL_TIME_UTIL_H_