Revert of Switch to standard integer types in sandbox/.

sandbox/linux/system_headers/i386_linux_ucontext.h

 // Copyright (c) 2012 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 SANDBOX_LINUX_SYSTEM_HEADERS_ANDROID_I386_UCONTEXT_H_
 #define SANDBOX_LINUX_SYSTEM_HEADERS_ANDROID_I386_UCONTEXT_H_
 
-#include <stddef.h>
-#include <stdint.h>
-
 // We do something compatible with glibc. Hopefully, at some point Android will
 // provide that for us, and __BIONIC_HAVE_UCONTEXT_T should be defined.
 // This is mostly copied from breakpad (common/android/include/sys/ucontext.h),
 // except we do use sigset_t for uc_sigmask instead of a custom type.
 
 #if !defined(__BIONIC_HAVE_UCONTEXT_T)
 #if !defined(__native_client_nonsfi__)
 #include <asm/sigcontext.h>
 #else
 // In PNaCl toolchain, sigcontext is not defined. So here declare it.
@@ skipping 66 matching lines @@
     uint32_t kernel_sigmask[2];
   };
   struct _libc_fpstate __fpregs_mem;
 } ucontext_t;
 
 #else
 #include <sys/ucontext.h>
 #endif  // __BIONIC_HAVE_UCONTEXT_T
 
 #endif  // SANDBOX_LINUX_SYSTEM_HEADERS_ANDROID_I386_UCONTEXT_H_