Revert of [ObjC ARC] Converts ios/chrome/browser/ui:ui to ARC.

ios/chrome/browser/ui/animation_util.mm

 // Copyright 2014 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 "ios/chrome/browser/ui/animation_util.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "ios/chrome/browser/ui/reversed_animation.h"
 
-#if !defined(__has_feature) || !__has_feature(objc_arc)
-#error "This file requires ARC support."
-#endif
-
 CAAnimation* FrameAnimationMake(CALayer* layer,
                                 CGRect beginFrame,
                                 CGRect endFrame) {
   CGRect beginBounds = {CGPointZero, beginFrame.size};
   CGRect endBounds = {CGPointZero, endFrame.size};
   CABasicAnimation* boundsAnimation =
       [CABasicAnimation animationWithKeyPath:@"bounds"];
   boundsAnimation.fromValue = [NSValue valueWithCGRect:beginBounds];
   boundsAnimation.toValue = [NSValue valueWithCGRect:endBounds];
   boundsAnimation.removedOnCompletion = NO;
@@ skipping 30 matching lines @@
   for (CAAnimation* animation in animations)
     duration = std::max(duration, animation.beginTime + animation.duration);
   animationGroup.duration = duration;
   animationGroup.fillMode = kCAFillModeBoth;
   animationGroup.removedOnCompletion = NO;
   return animationGroup;
 }
 
 CAAnimation* DelayedAnimationMake(CAAnimation* animation,
                                   CFTimeInterval delay) {
-  CAAnimation* delayedAnimation = [animation copy];
+  CAAnimation* delayedAnimation = [[animation copy] autorelease];
   if (delayedAnimation) {
     delayedAnimation.beginTime = delay;
     delayedAnimation = AnimationGroupMake(@[ delayedAnimation ]);
   }
   return delayedAnimation;
 }
 
 CABasicAnimation* FindAnimationForKeyPath(NSString* keyPath,
                                           CAAnimation* animation) {
   __block CABasicAnimation* animationForKeyPath = nil;
@@ skipping 12 matching lines @@
           *stop = animationForKeyPath != nil;
         }];
   }
   return animationForKeyPath;
 }
 
 void RemoveAnimationForKeyFromLayers(NSString* key, NSArray* layers) {
   for (CALayer* layer in layers)
     [layer removeAnimationForKey:key];
 }