Remove reference to old gn win x64 bot in roll_gn.py.

R=brettw@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/1947123004
Cr-Original-Commit-Position: refs/heads/master@{#391701}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: aec64c190cd89a0bc5e933fe96fc9a3641e29d7b
1 file changed
tree: 207342bce93729de8b86e7f2e0303af154078b06
  1. tools/