Include stddef.h for the definition of size_t.

These errors were caught by Clang.

BUG=82385

Review URL: https://chromiumcodereview.appspot.com/16196003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@203136 0039d316-1c4b-4281-b951-d872f2087c98

base/allocator/allocator_shim.h

@@ -5,6 +5,8 @@
 #ifndef BASE_ALLOCATOR_ALLOCATOR_SHIM_H_
 #define BASE_ALLOCATOR_ALLOCATOR_SHIM_H_
 
+#include <stddef.h>
+
 namespace base {
 namespace allocator {
 

sandbox/win/src/sidestep/preamble_patcher.h

@@ -7,6 +7,8 @@
 #ifndef SANDBOX_SRC_SIDESTEP_PREAMBLE_PATCHER_H__
 #define SANDBOX_SRC_SIDESTEP_PREAMBLE_PATCHER_H__
 
+#include <stddef.h>
+
 namespace sidestep {
 
 // Maximum size of the preamble stub. We overwrite at least the first 5