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Chrome cannot build with VS 2015 anymore. Having it listed as a
supported compiler can lead to confusion for new Chromium developers.
This change scrubs inappropriate '2015' references from the Chromium
repo.

Bug: 683729
Change-Id: I2e02bc31ae8fd57a31ac65f1bb8a45eb5a5cd433
Reviewed-on: https://chromium-review.googlesource.com/807526
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>
Reviewed-by: Scott Graham <scottmg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521829}