Moves a couple of the maximize mode classes to ash/common

ash/wm/maximize_mode/maximize_mode_window_state.h

Index: ash/wm/maximize_mode/maximize_mode_window_state.h
diff --git a/ash/wm/maximize_mode/maximize_mode_window_state.h b/ash/wm/maximize_mode/maximize_mode_window_state.h
index fd7f95fafb7b2005d5e1689b783e4e844319da95..ad53f2b5012a4b28ed1834aa1ed0803dad7e3ad0 100644
--- a/ash/wm/maximize_mode/maximize_mode_window_state.h
+++ b/ash/wm/maximize_mode/maximize_mode_window_state.h
@@ -12,6 +12,7 @@
 
 namespace ash {
 class MaximizeModeWindowManager;
+class WmWindow;
 
 // The MaximizeModeWindowState implementation which reduces all possible window
 // states to minimized and maximized. If a window cannot be maximized it will be
@@ -26,8 +27,7 @@ class MaximizeModeWindowState : public wm::WindowState::State {
   // state handler. Upon destruction it will restore the previous state handler
   // and call |creator::WindowStateDestroyed()| to inform that the window mode
   // was reverted to the old window manager.
-  MaximizeModeWindowState(aura::Window* window,
-                          MaximizeModeWindowManager* creator);
+  MaximizeModeWindowState(WmWindow* window, MaximizeModeWindowManager* creator);
   ~MaximizeModeWindowState() override;
 
   // Leaves the maximize mode by reverting to previous state object.
@@ -68,7 +68,7 @@ class MaximizeModeWindowState : public wm::WindowState::State {
   std::unique_ptr<wm::WindowState::State> old_state_;
 
   // The state object for this object which owns this instance.
-  aura::Window* window_;
+  WmWindow* window_;
 
   // The creator which needs to be informed when this state goes away.
   MaximizeModeWindowManager* creator_;