Promotes more accessors from WmShell to Shell

ash/common/wm/maximize_mode/maximize_mode_window_manager.cc

Index: ash/common/wm/maximize_mode/maximize_mode_window_manager.cc
diff --git a/ash/common/wm/maximize_mode/maximize_mode_window_manager.cc b/ash/common/wm/maximize_mode/maximize_mode_window_manager.cc
index fbaaaf2cdae0e863818b670fe8bc3eb83b8b7325..d4a3e88b044d4991c5ee76484f1875e24a4c4220 100644
--- a/ash/common/wm/maximize_mode/maximize_mode_window_manager.cc
+++ b/ash/common/wm/maximize_mode/maximize_mode_window_manager.cc
@@ -33,7 +33,7 @@ namespace {
 // Exits overview mode if it is currently active.
 void CancelOverview() {
   WindowSelectorController* controller =
-      WmShell::Get()->window_selector_controller();
+      Shell::Get()->window_selector_controller();
   if (controller->IsSelecting())
     controller->OnSelectionEnded();
 }