This flag is holding out a Skia change which fixes a number of shadows.
This removes the flag added in
https://chromium-review.googlesource.com/c/chromium/src/+/1050466 to keep
https://review.skia.org/126615 from requiring rebaselines when rolling.

Change-Id: Ibb3af277be20e70e146e805fe1a2e4171742eabc
Reviewed-on: https://chromium-review.googlesource.com/1050203
Commit-Queue: Florin Malita <fmalita@chromium.org>
Reviewed-by: Dominik Röttsches <drott@chromium.org>
Reviewed-by: Florin Malita <fmalita@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557163}