Fixes bug in WmWindowAura::OnWindowVisibilityChanged()

ash/aura/wm_window_aura.cc

Index: ash/aura/wm_window_aura.cc
diff --git a/ash/aura/wm_window_aura.cc b/ash/aura/wm_window_aura.cc
index 831751f6d9d2f585bdbdcf352c558824390b0c71..9715a7c339eba8b46c7859dccd40cfb05cffc405 100644
--- a/ash/aura/wm_window_aura.cc
+++ b/ash/aura/wm_window_aura.cc
@@ -857,6 +857,7 @@ void WmWindowAura::OnWindowDestroyed(aura::Window* window) {
 
 void WmWindowAura::OnWindowVisibilityChanging(aura::Window* window,
                                               bool visible) {
+  DCHECK_EQ(window, window_);
   FOR_EACH_OBSERVER(WmWindowObserver, observers_,
                     OnWindowVisibilityChanging(this, visible));
 }
@@ -864,7 +865,7 @@ void WmWindowAura::OnWindowVisibilityChanging(aura::Window* window,
 void WmWindowAura::OnWindowVisibilityChanged(aura::Window* window,
                                              bool visible) {
   FOR_EACH_OBSERVER(WmWindowObserver, observers_,
-                    OnWindowVisibilityChanged(this, visible));
+                    OnWindowVisibilityChanged(Get(window), visible));
 }
 
 void WmWindowAura::OnWindowTitleChanged(aura::Window* window) {