views: remove dead code

Now that DesktopNativeWidgetAura is not compiled on chromeos, this code
is unnecessary.

BUG=958241
TEST=none

Change-Id: I5903f1a2b3b53d95f75525eb9b8cdf555215189f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1627651
Reviewed-by: Evan Stade <estade@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662689}
2 files changed