Fix memory leak in etc1bitmap GM.

We never drop our first ref on fileData. (All our ref counts start at one).
SkAutoTUnref<T> is almost always the right thing to use for refcounted types.

BUG=skia:2635
R=krajcevski@google.com, mtklein@google.com

Author: mtklein@chromium.org

Review URL: https://codereview.chromium.org/310793003
1 file changed