Switch to standard integer types in base/process/.

base/process/memory_stubs.cc

 // Copyright (c) 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 "base/process/memory.h"
 
+#include <stddef.h>
 #include <stdlib.h>
 
 namespace base {
 
 void EnableTerminationOnOutOfMemory() {
 }
 
 void EnableTerminationOnHeapCorruption() {
 }
 
@@ skipping 13 matching lines @@
   *result = malloc(size);
   return *result != nullptr;
 }
 
 bool UncheckedCalloc(size_t num_items, size_t size, void** result) {
   *result = calloc(num_items, size);
   return *result != nullptr;
 }
 
 }  // namespace base