[ios clean] Moves animator and presenters under transitions

ios/clean/chrome/browser/ui/animators/zoom_transition_controller.mm

-// Copyright 2017 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.
-
-#import "ios/clean/chrome/browser/ui/animators/zoom_transition_controller.h"
-
-#import "ios/clean/chrome/browser/ui/animators/zoom_transition_animator.h"
-
-@implementation ZoomTransitionController
-@synthesize presentationKey = _presentationKey;
-
-#pragma mark - UIViewControllerTransitioningDelegate
-
-- (id<UIViewControllerAnimatedTransitioning>)
-animationControllerForPresentedController:(UIViewController*)presented
-                     presentingController:(UIViewController*)presenting
-                         sourceController:(UIViewController*)source {
-  ZoomTransitionAnimator* animator = [[ZoomTransitionAnimator alloc] init];
-  animator.presenting = YES;
-  animator.presentationKey = self.presentationKey;
-  [animator selectDelegate:@[ source, presenting ]];
-  return animator;
-}
-
-- (id<UIViewControllerAnimatedTransitioning>)
-animationControllerForDismissedController:(UIViewController*)dismissed {
-  ZoomTransitionAnimator* animator = [[ZoomTransitionAnimator alloc] init];
-  animator.presenting = NO;
-  animator.presentationKey = self.presentationKey;
-  [animator selectDelegate:@[ dismissed.presentingViewController ]];
-  return animator;
-}
-
-@end