Rename AMDHD7770 to RadeonHD7770.

Also drive-by cleanup of "Win8-MSVC-ShuttleB", none of which currently
exist.

No-Try: true
Change-Id: Ide28481939b7ec2a0733ab07673379c951123f5d
Reviewed-on: https://skia-review.googlesource.com/75361
Reviewed-by: Eric Boren <borenet@google.com>
Commit-Queue: Ben Wagner <benjaminwagner@google.com>
4 files changed