[presubmit] Use bin/gn rather than depot_tools gn

Change-Id: I649f07e036f184e6dbb3a335bdd979dedea27ec8
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/270876
Commit-Queue: Eric Boren <borenet@google.com>
Auto-Submit: Ben Wagner aka dogben <benjaminwagner@google.com>
Reviewed-by: Eric Boren <borenet@google.com>
1 file changed