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Since AAGUID always has fixed size(16), change |aaguid_| of
AttestedCredentialData from std::vector<uint8_t> to std::array<uint8_t,
16>.

This is a reland of  https://crrev.com/c/981682, which was reverted due
to combining use of templates with COMPONENTS_EXPORT and failed
compilation in win_msvc_dbg.

Bug: 780078
Change-Id: Iaa97895cabaa4685ca5909df8c3544a6e84ecf78
Reviewed-on: https://chromium-review.googlesource.com/996963Reviewed-by: Balazs Engedy <engedy@chromium.org>
Commit-Queue: Jun Choi <hongjunchoi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548443}