ui/views: convert usage of FOR_EACH_OBSERVER macro

ui/views/animation/bounds_animator.cc

Index: ui/views/animation/bounds_animator.cc
diff --git a/ui/views/animation/bounds_animator.cc b/ui/views/animation/bounds_animator.cc
index 3f0e65fd0f0d3adcebc6bacf5abd06c3612b2342..78c22580454f5167c5d9aa77bebe45ede14d9ace 100644
--- a/ui/views/animation/bounds_animator.cc
+++ b/ui/views/animation/bounds_animator.cc
@@ -264,16 +264,14 @@ void BoundsAnimator::AnimationContainerProgressed(
     repaint_bounds_.SetRect(0, 0, 0, 0);
   }
 
-  FOR_EACH_OBSERVER(BoundsAnimatorObserver,
-                    observers_,
-                    OnBoundsAnimatorProgressed(this));
+  for (BoundsAnimatorObserver& observer : observers_)
+    observer.OnBoundsAnimatorProgressed(this);
 
   if (!IsAnimating()) {
     // Notify here rather than from AnimationXXX to avoid deleting the animation
     // while the animation is calling us.
-    FOR_EACH_OBSERVER(BoundsAnimatorObserver,
-                      observers_,
-                      OnBoundsAnimatorDone(this));
+    for (BoundsAnimatorObserver& observer : observers_)
+      observer.OnBoundsAnimatorDone(this);
   }
 }