GitLab

The supports_isolated_split arg is no longer needed since all DFMs
support isolated splits.

Bug: 1126301
Change-Id: Idf1ef64bec372f21efd68cb9d05933690cf8b1c1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2617118
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Auto-Submit: Clark DuVall <cduvall@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841309}