Fix up #ifdefs in crypto/encryptor.h.
Fix up #ifdefs in crypto/encryptor.h.

This was causing scoped_nss_types.h to be incorrectly included in the chimera
build. (No actual consequence. The header is legal in the chimera, it's just
unnecessary.)

BUG=none

Review URL: https://codereview.chromium.org/1281033003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#342938}

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