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

cc/trees/layer_tree_host_unittest_animation.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/trees/layer_tree_host.h"
 
 #include <stdint.h>
 
 #include "cc/animation/animation_curve.h"
 #include "cc/animation/animation_host.h"
@@ skipping 840 matching lines @@
   }
 
   AnimationPlayer& ScrollOffsetPlayer(
       const LayerTreeHostImpl& host_impl,
       scoped_refptr<FakePictureLayer> layer) const {
     scoped_refptr<ElementAnimations> element_animations =
         host_impl.animation_host()->GetElementAnimationsForElementId(
             layer->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;
   }
 
   void BeginTest() override { PostSetNeedsCommitToMainThread(); }
 
   void DidCommit() override {
     if (layer_tree_host()->SourceFrameNumber() == 1) {
       // Add an update after the first commit to trigger the animation update
       // path.
@@ skipping 997 matching lines @@
  private:
   scoped_refptr<Layer> layer_;
   FakeContentLayerClient client_;
 };
 
 MULTI_THREAD_TEST_F(
     LayerTreeHostAnimationTestRebuildPropertyTreesOnAnimationSetNeedsCommit);
 
 }  // namespace
 }  // namespace cc