[mus+ash] Removes WmWindow from ash/shelf and ash/shell

ash/shell.cc

Index: ash/shell.cc
diff --git a/ash/shell.cc b/ash/shell.cc
index 047fccb62cfc310a9ede3841912900f48f070939..338f3d47c9f79871b7377c105e059dd0ae873953 100644
--- a/ash/shell.cc
+++ b/ash/shell.cc
@@ -529,17 +529,17 @@ void Shell::NotifyVirtualKeyboardActivated(bool activated,
     observer.OnVirtualKeyboardStateChanged(activated, root_window);
 }
 
-void Shell::NotifyShelfCreatedForRootWindow(WmWindow* root_window) {
+void Shell::NotifyShelfCreatedForRootWindow(aura::Window* root_window) {
   for (auto& observer : shell_observers_)
     observer.OnShelfCreatedForRootWindow(root_window);
 }
 
-void Shell::NotifyShelfAlignmentChanged(WmWindow* root_window) {
+void Shell::NotifyShelfAlignmentChanged(aura::Window* root_window) {
   for (auto& observer : shell_observers_)
     observer.OnShelfAlignmentChanged(root_window);
 }
 
-void Shell::NotifyShelfAutoHideBehaviorChanged(WmWindow* root_window) {
+void Shell::NotifyShelfAutoHideBehaviorChanged(aura::Window* root_window) {
   for (auto& observer : shell_observers_)
     observer.OnShelfAutoHideBehaviorChanged(root_window);
 }