Switch to standard integer types in extensions/browser/.

BUG=138542
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Review URL: https://codereview.chromium.org/1549643002

Cr-Commit-Position: refs/heads/master@{#366702}
diff --git a/extensions/browser/warning_service_factory.h b/extensions/browser/warning_service_factory.h
index 6ec905e..22b198d 100644
--- a/extensions/browser/warning_service_factory.h
+++ b/extensions/browser/warning_service_factory.h
@@ -5,6 +5,7 @@
 #ifndef EXTENSIONS_BROWSER_WARNING_SERVICE_FACTORY_H_
 #define EXTENSIONS_BROWSER_WARNING_SERVICE_FACTORY_H_
 
+#include "base/macros.h"
 #include "base/memory/singleton.h"
 #include "components/keyed_service/content/browser_context_keyed_service_factory.h"