Switch to standard integer types in ios/.

ios/chrome/browser/about_flags.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.
 
 // Implementation of about_flags for iOS that sets flags based on experimental
 // settings.
 
 #ifndef IOS_CHROME_BROWSER_ABOUT_FLAGS_H_
 #define IOS_CHROME_BROWSER_ABOUT_FLAGS_H_
 
+#include <stddef.h>
+
 #include "components/flags_ui/flags_state.h"
 
 namespace base {
 class CommandLine;
 class ListValue;
 }
 
 namespace flags_ui {
 class FlagsStorage;
 }
@@ skipping 21 matching lines @@
 void ResetAllFlags(flags_ui::FlagsStorage* flags_storage);
 
 namespace testing {
 
 // Returns the global set of feature entries.
 const flags_ui::FeatureEntry* GetFeatureEntries(size_t* count);
 
 }  // namespace testing
 
 #endif  // IOS_CHROME_BROWSER_ABOUT_FLAGS_H_