wm: Fix tidy layer tests for 9a397212.
wm: Fix tidy layer tests for 9a397212.

BUG=none
TEST=ran it
TBR=gspencer

Review URL: http://codereview.chromium.org/1711026

joshfire/chromiumos-platform-window_manager,joshfire/chromiumos-platform-window_manager,joshfire/chromiumos-platform-window_manager,joshfire/chromiumos-platform-window_manager