[mus+ash] Removes WmWindow from ash/wm/root_window_finder.h

ash/shell_port.cc

Index: ash/shell_port.cc
diff --git a/ash/shell_port.cc b/ash/shell_port.cc
index 244d0c9a033a08654170f305a7cc129f29312345..fac68e86f5849e7b15d5b5a3c0f993d0bf14c206 100644
--- a/ash/shell_port.cc
+++ b/ash/shell_port.cc
@@ -47,9 +47,9 @@ void ShellPort::ShowContextMenu(const gfx::Point& location_in_screen,
     return;
   }
 
-  WmWindow* root = wm::GetRootWindowAt(location_in_screen);
-  root->GetRootWindowController()->ShowContextMenu(location_in_screen,
-                                                   source_type);
+  aura::Window* root = wm::GetRootWindowAt(location_in_screen);
+  RootWindowController::ForWindow(root)->ShowContextMenu(location_in_screen,
+                                                         source_type);
 }
 
 void ShellPort::OnLockStateEvent(LockStateObserver::EventType event) {