Switch to standard integer types in extensions/.

BUG=138542
[email protected]

Review URL: https://codereview.chromium.org/1543053002

Cr-Commit-Position: refs/heads/master@{#366716}
diff --git a/extensions/renderer/api_definitions_natives.h b/extensions/renderer/api_definitions_natives.h
index e6da645a..dcc1b73 100644
--- a/extensions/renderer/api_definitions_natives.h
+++ b/extensions/renderer/api_definitions_natives.h
@@ -5,6 +5,7 @@
 #ifndef EXTENSIONS_RENDERER_API_DEFINITIONS_NATIVES_H_
 #define EXTENSIONS_RENDERER_API_DEFINITIONS_NATIVES_H_
 
+#include "base/macros.h"
 #include "extensions/renderer/object_backed_native_handler.h"
 #include "v8/include/v8.h"