Converts ShellObserver from aura::Window to ash::WmWindow

ash/aura/wm_root_window_controller_aura.cc

Index: ash/aura/wm_root_window_controller_aura.cc
diff --git a/ash/aura/wm_root_window_controller_aura.cc b/ash/aura/wm_root_window_controller_aura.cc
index 8096034a39afc9b9186dde6778708a5333b1c76e..7edf0af90f869e099895076a42b64856b1c6f163 100644
--- a/ash/aura/wm_root_window_controller_aura.cc
+++ b/ash/aura/wm_root_window_controller_aura.cc
@@ -124,8 +124,9 @@ void WmRootWindowControllerAura::OnDisplayWorkAreaInsetsChanged() {
 
 void WmRootWindowControllerAura::OnFullscreenStateChanged(
     bool is_fullscreen,
-    aura::Window* root_window) {
-  if (root_window != root_window_controller_->GetRootWindow())
+    WmWindow* root_window) {
+  if (WmWindowAura::GetAuraWindow(root_window) !=
+      root_window_controller_->GetRootWindow())
     return;
 
   FOR_EACH_OBSERVER(WmRootWindowControllerObserver, observers_,
@@ -133,8 +134,9 @@ void WmRootWindowControllerAura::OnFullscreenStateChanged(
 }
 
 void WmRootWindowControllerAura::OnShelfAlignmentChanged(
-    aura::Window* root_window) {
-  if (root_window != root_window_controller_->GetRootWindow())
+    WmWindow* root_window) {
+  if (WmWindowAura::GetAuraWindow(root_window) !=
+      root_window_controller_->GetRootWindow())
     return;
 
   FOR_EACH_OBSERVER(WmRootWindowControllerObserver, observers_,