Change overview mode to so that docked panel windows are not grouped together.

ash/system/overview/overview_button_tray.cc

Index: ash/system/overview/overview_button_tray.cc
diff --git a/ash/system/overview/overview_button_tray.cc b/ash/system/overview/overview_button_tray.cc
index 7c8a920df2ca8b157af765fb1aa3bcea3d9692d7..ec2912fa209d008cc62ac4496737993227e6a4e5 100644
--- a/ash/system/overview/overview_button_tray.cc
+++ b/ash/system/overview/overview_button_tray.cc
@@ -69,7 +69,7 @@ void OverviewButtonTray::OnMaximizeModeEnded() {
   UpdateIconVisibility();
 }
 
-void OverviewButtonTray::OnOverviewModeEnding() {
+void OverviewButtonTray::OnOverviewModeEnded() {
   SetDrawBackgroundAsActive(false);
 }