delete some dead code in SampleApp

Change-Id: Ie01859eafbde292fe7f5228512c4134acf6d452b
Reviewed-on: https://skia-review.googlesource.com/18265
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>
2 files changed