Switch to standard integer types in base/.

BUG=138542
[email protected]
NOPRESUBMIT=true

Review URL: https://codereview.chromium.org/1538743002

Cr-Commit-Position: refs/heads/master@{#366910}
diff --git a/base/supports_user_data.h b/base/supports_user_data.h
index 711ee7d..5c1c7e9 100644
--- a/base/supports_user_data.h
+++ b/base/supports_user_data.h
@@ -8,6 +8,7 @@
 #include <map>
 
 #include "base/base_export.h"
+#include "base/macros.h"
 #include "base/memory/linked_ptr.h"
 #include "base/memory/ref_counted.h"
 #include "base/threading/thread_checker.h"