GitLab

Android recently launched a public version of Android Flash Tool. This
updates our device setup instructions to refer external contributors to
use the public tool.

Bug: 918221
Test: Upload to gerrit > open file > click "gitiles"
Change-Id: I4956ee9633242e6c727f9dfd7ccf378a2c44fb11
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2147691
Auto-Submit: Nate Fischer <ntfschr@chromium.org>
Commit-Queue: Shimi Zhang <ctzsm@chromium.org>
Reviewed-by: Shimi Zhang <ctzsm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758656}