Switch to standard integer types in extensions/.

BUG=138542
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Review URL: https://codereview.chromium.org/1543053002

Cr-Commit-Position: refs/heads/master@{#366716}
diff --git a/extensions/renderer/test_native_handler.h b/extensions/renderer/test_native_handler.h
index 057329d..88e5d239 100644
--- a/extensions/renderer/test_native_handler.h
+++ b/extensions/renderer/test_native_handler.h
@@ -6,6 +6,7 @@
 #define EXTENSIONS_RENDERER_TEST_NATIVE_HANDLER_H_
 
 #include "base/compiler_specific.h"
+#include "base/macros.h"
 #include "extensions/renderer/object_backed_native_handler.h"
 #include "v8/include/v8.h"