Add a PGO tag for the PGO builds in chrome://version (reland)

Also remove the VS2013 version string as we don't support it anymore.

This is a partial reland of https://codereview.chromium.org/2157563002
(minus the GYP code, which didn't worked anyway).

TBR'ing as it has already been reviewed.

TBR=sky@chromium.org
BUG=309849

Review-Url: https://codereview.chromium.org/2235333002
Cr-Commit-Position: refs/heads/master@{#411528}
3 files changed