Remove PATCH_PROJECT from gclient config. It is not used.

R=tandrii@chromium.org

Bug: 694348
Change-Id: I56e4aefbe5e9b23296553bb61f878d6426197fa7
Reviewed-on: https://chromium-review.googlesource.com/1232873
Commit-Queue: Nodir Turakulov <nodir@chromium.org>
Commit-Queue: Robbie Iannucci <iannucci@chromium.org>
Auto-Submit: Nodir Turakulov <nodir@chromium.org>
Reviewed-by: Robbie Iannucci <iannucci@chromium.org>