Switch to standard integer types in ios/.

ios/chrome/browser/install_time_util.mm

 // 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.
 
 #include "ios/chrome/browser/install_time_util.h"
 
 #include <Foundation/Foundation.h>
+#include <stdint.h>
 
 #include "base/mac/foundation_util.h"
 
 namespace {
 
 NSString* const kInstallationTimeKey = @"omaha.InstallationTime";
 
 // Returns the installation time of the application: this is the time the
 // application was first installed, not the time the last version was installed.
 // If the installation time is unknown, returns a base::Time corresponding to
 // |kUnknownInstallDate|.
 // To be noted: this value is reset if the application is uninstalled.
 base::Time GetNSUserDefaultsInstallationTime() {
   NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
   CFAbsoluteTime time = [defaults doubleForKey:kInstallationTimeKey];
   if (time == 0.0)
     return base::Time();
   return base::Time::FromCFAbsoluteTime(time);
 }
 
 }  // namespace
 
 namespace install_time_util {
 
 // 2 is used because 0 is a magic value for Time, and 1 was the pre-M29 value
 // which was migrated to a specific date (crbug.com/270124).
-const int64 kUnknownInstallDate = 2;
+const int64_t kUnknownInstallDate = 2;
 
 base::Time ComputeInstallationTime(bool is_first_run) {
   return ComputeInstallationTimeInternal(is_first_run,
                                          GetNSUserDefaultsInstallationTime());
 }
 
 base::Time ComputeInstallationTimeInternal(
     bool is_first_run,
     base::Time ns_user_defaults_install_time) {
   if (is_first_run)
     return base::Time::Now();
 
   if (ns_user_defaults_install_time.is_null())
     return base::Time::FromTimeT(kUnknownInstallDate);
 
   return ns_user_defaults_install_time;
 }
 
 }  // namespace install_time_util