Switch to standard integer types in base/android/.

base/android/sys_utils_unittest.cc

 // 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.
 
+#include <stddef.h>
 #include <unistd.h>
 
 #include "base/sys_info.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
 namespace android {
 
 TEST(SysUtils, AmountOfPhysicalMemory) {
   // Check that the RAM size reported by sysconf() matches the one
   // computed by base::SysInfo::AmountOfPhysicalMemory().
   size_t sys_ram_size =
       static_cast<size_t>(sysconf(_SC_PHYS_PAGES) * PAGE_SIZE);
   EXPECT_EQ(sys_ram_size,
             static_cast<size_t>(SysInfo::AmountOfPhysicalMemory()));
 }
 
 }  // namespace android
 }  // namespace base