CC Animation: Rework iterations over players to use the range-based for loop.

cc/test/animation_test_common.cc

 // Copyright 2012 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 "cc/test/animation_test_common.h"
 
 #include "base/memory/ptr_util.h"
 #include "cc/animation/animation_host.h"
 #include "cc/animation/animation_id_provider.h"
 #include "cc/animation/animation_player.h"
@@ skipping 291 matching lines @@
 }
 
 void AddAnimationToElementWithExistingPlayer(
     ElementId element_id,
     scoped_refptr<AnimationTimeline> timeline,
     std::unique_ptr<Animation> animation) {
   scoped_refptr<ElementAnimations> element_animations =
       timeline->animation_host()->GetElementAnimationsForElementId(element_id);
   DCHECK(element_animations);
   DCHECK(element_animations->players_list().might_have_observers());
-  ElementAnimations::PlayersList::Iterator it(
-      &element_animations->players_list());
-  AnimationPlayer* player = it.GetNext();
+  AnimationPlayer* player = &*element_animations->players_list().begin();
   DCHECK(player);
   player->AddAnimation(std::move(animation));
 }
 
 void RemoveAnimationFromElementWithExistingPlayer(
     ElementId element_id,
     scoped_refptr<AnimationTimeline> timeline,
     int animation_id) {
   scoped_refptr<ElementAnimations> element_animations =
       timeline->animation_host()->GetElementAnimationsForElementId(element_id);
   DCHECK(element_animations);
   DCHECK(element_animations->players_list().might_have_observers());
-  ElementAnimations::PlayersList::Iterator it(
-      &element_animations->players_list());
-  AnimationPlayer* player = it.GetNext();
+  AnimationPlayer* player = &*element_animations->players_list().begin();
   DCHECK(player);
   player->RemoveAnimation(animation_id);
 }
 
 Animation* GetAnimationFromElementWithExistingPlayer(
     ElementId element_id,
     scoped_refptr<AnimationTimeline> timeline,
     int animation_id) {
   scoped_refptr<ElementAnimations> element_animations =
       timeline->animation_host()->GetElementAnimationsForElementId(element_id);
   DCHECK(element_animations);
   DCHECK(element_animations->players_list().might_have_observers());
-  ElementAnimations::PlayersList::Iterator it(
-      &element_animations->players_list());
-  AnimationPlayer* player = it.GetNext();
+  AnimationPlayer* player = &*element_animations->players_list().begin();
   DCHECK(player);
   return player->GetAnimationById(animation_id);
 }
 
 int AddAnimatedFilterToElementWithPlayer(
     ElementId element_id,
     scoped_refptr<AnimationTimeline> timeline,
     double duration,
     float start_brightness,
     float end_brightness) {
@@ skipping 45 matching lines @@
   scoped_refptr<AnimationPlayer> player =
       AnimationPlayer::Create(AnimationIdProvider::NextPlayerId());
   timeline->AttachPlayer(player);
   player->AttachElement(element_id);
   DCHECK(player->element_animations());
   return AddOpacityTransitionToPlayer(player.get(), duration, start_opacity,
                                       end_opacity, use_timing_function);
 }
 
 }  // namespace cc