Remove dependency on recipe_engine/shutil.

R=borenet@google.com

Bug: chromium:739984
Change-Id: I077c4e6f494eb7e93851201120048ba1ef5faa07
Reviewed-on: https://skia-review.googlesource.com/21921
Commit-Queue: Eric Boren <borenet@google.com>
Reviewed-by: Eric Boren <borenet@google.com>
157 files changed