Remove legacy InfoBarViewProtocol.

ios/chrome/browser/infobars/infobar_container_view.mm

 // 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.
 
 #import "ios/chrome/browser/infobars/infobar_container_view.h"
 
 #include "base/logging.h"
 #include "ios/chrome/browser/infobars/infobar.h"
-#include "ios/chrome/browser/ui/infobars/infobar_view_protocol.h"
+#include "ios/chrome/browser/ui/infobars/infobar_view.h"
 #include "ui/base/device_form_factor.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 @implementation InfoBarContainerView
 
 - (void)addInfoBar:(InfoBarIOS*)infoBarIOS position:(NSInteger)position {
   DCHECK_LE((NSUInteger)position, [[self subviews] count]);
@@ skipping 15 matching lines @@
       CGFloat elementHeight = [view sizeThatFits:size].height;
       if (elementHeight > height)
         height = elementHeight;
     }
   }
   size.height = height;
   return size;
 }
 
 - (void)layoutSubviews {
-  for (UIView<InfoBarViewProtocol>* view in self.subviews) {
+  for (InfoBarView* view in self.subviews) {
     [view sizeToFit];
     CGRect frame = view.frame;
     frame.origin.y = CGRectGetHeight(frame) - [view visibleHeight];
     [view setFrame:frame];
   }
 }
 
 - (CGFloat)topmostVisibleInfoBarHeight {
-  for (UIView<InfoBarViewProtocol>* view in
-       [self.subviews reverseObjectEnumerator]) {
+  for (InfoBarView* view in [self.subviews reverseObjectEnumerator]) {
     return [view sizeThatFits:self.frame.size].height;
   }
   return 0;
 }
 
 @end