Remove usage of FOR_EACH_OBSERVER macro in ash/aura

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 0bff46ef796b6eaf2eaa81cd1e5c03b1ed5e02d3..4536719a982271cc1184f0e568ee7dfbb72c2743 100644
--- a/ash/aura/wm_window_aura.cc
+++ b/ash/aura/wm_window_aura.cc
@@ -810,8 +810,8 @@ void WmWindowAura::OnWindowHierarchyChanging(
   wm_params.target = Get(params.target);
   wm_params.new_parent = Get(params.new_parent);
   wm_params.old_parent = Get(params.old_parent);
-  FOR_EACH_OBSERVER(WmWindowObserver, observers_,
-                    OnWindowTreeChanging(this, wm_params));
+  for (auto& observer : observers_)
+    observer.OnWindowTreeChanging(this, wm_params);
 }
 
 void WmWindowAura::OnWindowHierarchyChanged(
@@ -820,13 +820,13 @@ void WmWindowAura::OnWindowHierarchyChanged(
   wm_params.target = Get(params.target);
   wm_params.new_parent = Get(params.new_parent);
   wm_params.old_parent = Get(params.old_parent);
-  FOR_EACH_OBSERVER(WmWindowObserver, observers_,
-                    OnWindowTreeChanged(this, wm_params));
+  for (auto& observer : observers_)
+    observer.OnWindowTreeChanged(this, wm_params);
 }
 
 void WmWindowAura::OnWindowStackingChanged(aura::Window* window) {
-  FOR_EACH_OBSERVER(WmWindowObserver, observers_,
-                    OnWindowStackingChanged(this));
+  for (auto& observer : observers_)
+    observer.OnWindowStackingChanged(this);
 }
 
 void WmWindowAura::OnWindowPropertyChanged(aura::Window* window,
@@ -856,52 +856,55 @@ void WmWindowAura::OnWindowPropertyChanged(aura::Window* window,
   } else {
     return;
   }
-  FOR_EACH_OBSERVER(WmWindowObserver, observers_,
-                    OnWindowPropertyChanged(this, wm_property));
+  for (auto& observer : observers_)
+    observer.OnWindowPropertyChanged(this, wm_property);
 }
 
 void WmWindowAura::OnWindowBoundsChanged(aura::Window* window,
                                          const gfx::Rect& old_bounds,
                                          const gfx::Rect& new_bounds) {
-  FOR_EACH_OBSERVER(WmWindowObserver, observers_,
-                    OnWindowBoundsChanged(this, old_bounds, new_bounds));
+  for (auto& observer : observers_)
+    observer.OnWindowBoundsChanged(this, old_bounds, new_bounds);
 }
 
 void WmWindowAura::OnWindowDestroying(aura::Window* window) {
-  FOR_EACH_OBSERVER(WmWindowObserver, observers_, OnWindowDestroying(this));
+  for (auto& observer : observers_)
+    observer.OnWindowDestroying(this);
 }
 
 void WmWindowAura::OnWindowDestroyed(aura::Window* window) {
-  FOR_EACH_OBSERVER(WmWindowObserver, observers_, OnWindowDestroyed(this));
+  for (auto& observer : observers_)
+    observer.OnWindowDestroyed(this);
 }
 
 void WmWindowAura::OnWindowVisibilityChanging(aura::Window* window,
                                               bool visible) {
   DCHECK_EQ(window, window_);
-  FOR_EACH_OBSERVER(WmWindowObserver, observers_,
-                    OnWindowVisibilityChanging(this, visible));
+  for (auto& observer : observers_)
+    observer.OnWindowVisibilityChanging(this, visible);
 }
 
 void WmWindowAura::OnWindowVisibilityChanged(aura::Window* window,
                                              bool visible) {
-  FOR_EACH_OBSERVER(WmWindowObserver, observers_,
-                    OnWindowVisibilityChanged(Get(window), visible));
+  for (auto& observer : observers_)
+    observer.OnWindowVisibilityChanged(Get(window), visible);
 }
 
 void WmWindowAura::OnWindowTitleChanged(aura::Window* window) {
-  FOR_EACH_OBSERVER(WmWindowObserver, observers_, OnWindowTitleChanged(this));
+  for (auto& observer : observers_)
+    observer.OnWindowTitleChanged(this);
 }
 
 void WmWindowAura::OnTransientChildAdded(aura::Window* window,
                                          aura::Window* transient) {
-  FOR_EACH_OBSERVER(WmTransientWindowObserver, transient_observers_,
-                    OnTransientChildAdded(this, Get(transient)));
+  for (auto& observer : transient_observers_)
+    observer.OnTransientChildAdded(this, Get(transient));
 }
 
 void WmWindowAura::OnTransientChildRemoved(aura::Window* window,
                                            aura::Window* transient) {
-  FOR_EACH_OBSERVER(WmTransientWindowObserver, transient_observers_,
-                    OnTransientChildRemoved(this, Get(transient)));
+  for (auto& observer : transient_observers_)
+    observer.OnTransientChildRemoved(this, Get(transient));
 }
 
 }  // namespace ash