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New versions of C++ make aggregate initalization with truncation a hard
error. VC++ gives warnings if old initialization syntaxes are used, for
backwards compatibility, but gives a hard error for C++ 11 syntax.

This change adds the casts needed to make this one spot build, which is
sufficient since it is currently the only troublesome spot by the VC++
rules.

Change-Id: I3b597cc8ce628135cfdbb3b91a8b2f9d54562d34
Reviewed-on: https://chromium-review.googlesource.com/1039195
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555683}