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This is a single character change to temporarily switch Chrome to
building with VC++ 2017. This CL is currently purely for testing
purposes and will be landed for the weekend in order to flesh out any
remaining bugs.

This is a retry of crrev.com/2762093003 which failed due to a compiler
warning which was missed in local testing and the try bots. That warning
has been resolved and a local build of 'all' completed cleanly.

BUG=683729

Review-Url: https://codereview.chromium.org/2852433005
Cr-Commit-Position: refs/heads/master@{#468239}