[ios clean] Moves animator and presenters under transitions

ios/clean/chrome/browser/ui/tab/tab_container_view_controller.mm

 // 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.
 
 #import "ios/clean/chrome/browser/ui/tab/tab_container_view_controller.h"
 
 #import "ios/clean/chrome/browser/ui/ui_types.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
@@ skipping 166 matching lines @@
   [viewController.view removeFromSuperview];
   [viewController removeFromParentViewController];
 }
 
 #pragma mark - MenuPresentationDelegate
 
 - (CGRect)boundsForMenuPresentation {
   return self.view.bounds;
 }
 - (CGRect)originForMenuPresentation {
-  return [self rectForZoomWithKey:@"" inView:self.view];
+  return [self rectForZoomWithKey:nil inView:self.view];
 }
 
 #pragma mark - ZoomTransitionDelegate
 
 - (CGRect)rectForZoomWithKey:(NSObject*)key inView:(UIView*)view {
   if ([self.toolbarViewController
           conformsToProtocol:@protocol(ZoomTransitionDelegate)]) {
     return [reinterpret_cast<id<ZoomTransitionDelegate>>(
         self.toolbarViewController) rectForZoomWithKey:key
                                                 inView:view];
@@ skipping 110 matching lines @@
         constraintEqualToAnchor:self.view.leadingAnchor],
     [self.toolbarView.trailingAnchor
         constraintEqualToAnchor:self.view.trailingAnchor],
     self.toolbarHeightConstraint,
     [self.toolbarView.bottomAnchor
         constraintEqualToAnchor:self.bottomLayoutGuide.topAnchor],
   ];
 }
 
 @end