Revert of Switch to standard integer types in sandbox/.

sandbox/linux/system_headers/linux_signal.h

 // 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.
 
 #ifndef SANDBOX_LINUX_SYSTEM_HEADERS_LINUX_SIGNAL_H_
 #define SANDBOX_LINUX_SYSTEM_HEADERS_LINUX_SIGNAL_H_
 
-#include <stdint.h>
-
 // NOTE: On some toolchains, signal related ABI is incompatible with Linux's
 // (not undefined, but defined different values and in different memory
 // layouts). So, fill the gap here.
 #if defined(__i386__) || defined(__x86_64__) || defined(__arm__) || \
     defined(__aarch64__)
 
 #define LINUX_SIGHUP 1
 #define LINUX_SIGINT 2
 #define LINUX_SIGQUIT 3
 #define LINUX_SIGABRT 6
@@ skipping 117 matching lines @@
 #else
 struct LinuxSigAction {
   void (*kernel_handler)(int);
   uint32_t sa_flags;
   void (*sa_restorer)(void);
   LinuxSigSet sa_mask;
 };
 #endif
 
 #endif  // SANDBOX_LINUX_SYSTEM_HEADERS_LINUX_SIGNAL_H_