Fix memory leak in GPU Picture optimization

R=jvanverth@google.com

Author: robertphillips@google.com

Review URL: https://codereview.chromium.org/265763008

git-svn-id: http://skia.googlecode.com/svn/trunk/src@14589 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed