Switch to standard integer types in ios/.

ios/chrome/browser/crash_report/crash_keys.cc

 // Copyright 2015 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/crash_report/crash_keys.h"
 
+#include <stddef.h>
+
 #include "base/debug/crash_logging.h"
 #include "base/macros.h"
 #include "components/crash/core/common/crash_keys.h"
 
 size_t RegisterChromeIOSCrashKeys() {
   // The following keys may be chunked by the underlying crash logging system,
   // but ultimately constitute a single key-value pair.
   base::debug::CrashKey fixed_keys[] = {
       {crash_keys::kBug464926CrashKey, crash_keys::kSmallSize},
       {crash_keys::kChannel, crash_keys::kSmallSize},
       {crash_keys::kMetricsClientId, crash_keys::kSmallSize},
       {crash_keys::kNumVariations, crash_keys::kSmallSize},
       {crash_keys::kVariations, crash_keys::kLargeSize},
       {crash_keys::mac::kZombie, crash_keys::kMediumSize},
       {crash_keys::mac::kZombieTrace, crash_keys::kMediumSize},
   };
 
   return base::debug::InitCrashKeys(fixed_keys, arraysize(fixed_keys),
                                     crash_keys::kChunkMaxLength);
 }