Tidy up DEPS

 - Sort alphabetically and align on ':'.
 - Remove yasm deps.  They're unused since we switched to GN.
 - Remove fetch-gn hook.  git-sync-deps does this now.
 - Remove comments about why DEPS are needed.
   They're all pretty obvious if you grep for the dependency name.

Change-Id: Iefd1a14560f227e957a206e51db8c8ba5520f57b
Reviewed-on: https://skia-review.googlesource.com/9197
Reviewed-by: Matt Sarett <msarett@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
1 file changed