Moves couple of WmShell methods to standalone functions

ash/common/wm/maximize_mode/maximize_mode_event_handler.cc

Index: ash/common/wm/maximize_mode/maximize_mode_event_handler.cc
diff --git a/ash/common/wm/maximize_mode/maximize_mode_event_handler.cc b/ash/common/wm/maximize_mode/maximize_mode_event_handler.cc
index 55838ef198e4e2ed75b0ea48e76ab0f6303572d8..12279b53c48f9fbf34ab473cb4fd24a7094aa2f0 100644
--- a/ash/common/wm/maximize_mode/maximize_mode_event_handler.cc
+++ b/ash/common/wm/maximize_mode/maximize_mode_event_handler.cc
@@ -11,6 +11,7 @@
 #include "ash/common/wm_shell.h"

[James Cook, 2017/03/31 19:29:52]

still needed?

[sky, 2017/03/31 20:15:14]

Done.

 #include "ash/common/wm_window.h"
 #include "ash/shell.h"
+#include "ash/wm/window_util.h"
 #include "ui/events/event.h"
 
 namespace ash {
@@ -39,7 +40,7 @@ bool MaximizeModeEventHandler::ToggleFullscreen(const ui::TouchEvent& event) {
   }
 
   // Find the active window (from the primary screen) to un-fullscreen.
-  WmWindow* window = WmShell::Get()->GetActiveWindow();
+  WmWindow* window = WmWindow::Get(GetActiveWindow());
   if (!window)
     return false;