Switch to standard integer types in net/.

BUG=488550
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Review URL: https://codereview.chromium.org/1535363003 .

Cr-Commit-Position: refs/heads/master@{#366297}
diff --git a/net/test/ct_test_util.h b/net/test/ct_test_util.h
index 5bb2d7a..72629ab 100644
--- a/net/test/ct_test_util.h
+++ b/net/test/ct_test_util.h
@@ -5,6 +5,9 @@
 #ifndef NET_CERT_CT_TEST_UTIL_H_
 #define NET_CERT_CT_TEST_UTIL_H_
 
+#include <stddef.h>
+#include <stdint.h>
+
 #include <string>
 #include <vector>