Remove unneeded SK_SUPPORT_GPU checks in gpu only files.

Bug: skia:
Change-Id: I8f25c883f7d741866ac850c8e0ba9f439830570f
Reviewed-on: https://skia-review.googlesource.com/119008
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
5 files changed