Update DEPS to use googlesource mirrors

Bug: skia:7509
Change-Id: I514b4260ffffd4de0f6182f745b475f169adbaf2
Reviewed-on: https://skia-review.googlesource.com/101500
Reviewed-by: Mike Klein <mtklein@chromium.org>
Reviewed-by: Hal Canary <halcanary@google.com>
Commit-Queue: Eric Boren <borenet@google.com>
1 file changed