GitLab

Fixes a regression from https://codereview.chromium.org/2009853002
IDK why it matters or if it relates to [still] broken window dragging.

TODO: Fix wallpaper picker dragging (not broken by same CL)...

BUG=557405
TEST=wallpaper picker shows for "Set wallpaper..." in mash.
R=markdittmer@chromium.org,sky@chromium.org,sadrul@chromium.org

Review-Url: https://codereview.chromium.org/2037013003
Cr-Commit-Position: refs/heads/master@{#397873}