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/request_sender.h b/extensions/renderer/request_sender.h
index c3b8538..245c0fe 100644
--- a/extensions/renderer/request_sender.h
+++ b/extensions/renderer/request_sender.h
@@ -8,6 +8,7 @@
 #include <map>
 #include <string>
 
+#include "base/macros.h"
 #include "base/memory/linked_ptr.h"
 #include "v8/include/v8.h"