Remove the now unused GR_PROXY_MOVE macro

Change-Id: I9655a3032aea9c40e87742c76ad9a9ab42a159dc
Reviewed-on: https://skia-review.googlesource.com/27841
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
15 files changed