Check for both TLS 1.2 and AES-GCM support in SSLServerSocket tests.
Check for both TLS 1.2 and AES-GCM support in SSLServerSocket tests.

This is a speculative fix for crbug.com/484034. It seems NSS added AES-GCM
support before the key derivation steps for TLS 1.2, so there may be versions
of NSS which support the former but not the latter.

BUG=484034

Review URL: https://codereview.chromium.org/1126633002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#328164}

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