Remove CPU dimension for Win GCE bots

This is mainly to collapse the two groups on the capacity stats page.

Bug: skia:
Change-Id: Icc125f6fa773ebf11909b0606bc7958146da5983
Reviewed-on: https://skia-review.googlesource.com/11417
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Eric Boren <borenet@google.com>
2 files changed