Remove unnecessary includes from Viewer

Bug: skia:
Change-Id: I7b20db66a7eb5b549997fd4307e41937a8753921
Reviewed-on: https://skia-review.googlesource.com/86020
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
1 file changed