Remove usage of FOR_EACH_OBSERVER macro in ash/common

ash/common/shelf/shelf_background_animator.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/common/shelf/shelf_background_animator.h"
 
 #include <algorithm>
 
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/shelf/shelf_background_animator_observer.h"
@@ skipping 70 matching lines @@
   ++successful_animator_count_;
   DCHECK_LE(successful_animator_count_, kNumAnimators);
   // UpdateBackground() is only called when alpha values change, this ensures
   // observers are always notified for every background change.
   OnAlphaChanged(animator, animator->alpha());
 }
 
 void ShelfBackgroundAnimator::OnAlphaChanged(BackgroundAnimator* animator,
                                              int alpha) {
   if (animator == opaque_background_animator_.get()) {
-    FOR_EACH_OBSERVER(ShelfBackgroundAnimatorObserver, observers_,
-                      UpdateShelfOpaqueBackground(alpha));
+    for (auto& observer : observers_)
+      observer.UpdateShelfOpaqueBackground(alpha);
   } else if (animator == asset_background_animator_.get()) {
-    FOR_EACH_OBSERVER(ShelfBackgroundAnimatorObserver, observers_,
-                      UpdateShelfAssetBackground(alpha));
+    for (auto& observer : observers_)
+      observer.UpdateShelfAssetBackground(alpha);
   } else if (animator == item_background_animator_.get()) {
-    FOR_EACH_OBSERVER(ShelfBackgroundAnimatorObserver, observers_,
-                      UpdateShelfItemBackground(alpha));
+    for (auto& observer : observers_)
+      observer.UpdateShelfItemBackground(alpha);
   } else {
     NOTREACHED();
   }
 }
 
 void ShelfBackgroundAnimator::AnimateBackground(
     ShelfBackgroundType background_type,
     BackgroundAnimatorChangeType change_type) {
   // Ensure BackgroundAnimationEnded() has been called for all the
   // BackgroundAnimators owned by this so that |successful_animator_count_|
@@ skipping 88 matching lines @@
 void ShelfBackgroundAnimator::StopAnimators() {
   if (opaque_background_animator_)
     opaque_background_animator_->Stop();
   if (asset_background_animator_)
     asset_background_animator_->Stop();
   if (item_background_animator_)
     item_background_animator_->Stop();
 }
 
 }  // namespace ash