Clear Zone.Identifier to allow depot_tools.zip bootstrap
Clear Zone.Identifier to allow depot_tools.zip bootstrap

BUG=680274

Change-Id: I47fd8d7a5380aca49c873006c4f66732b21bee37
Reviewed-on: https://chromium-review.googlesource.com/427323
Reviewed-by: Vadim Shtayura <9f116ddb1b24f6fc1916a676eb17161b6c07dfc1@chromium.org>
Commit-Queue: Robbie Iannucci <40f3d43a28ebae3cb819288542e1c84d73d962d5@chromium.org>

CoherentLabs/depot_tools,CoherentLabs/depot_tools