Fix GrTextureStripAtlasManager cleanup order bug

Bug: 820703
Change-Id: I6f1a895ceb213d38361bc03a472cf2a48e4720a5
Reviewed-on: https://skia-review.googlesource.com/115001
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
7 files changed