ios: Stop using __weak.

ios/chrome/browser/infobars/confirm_infobar_controller.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.
 
 #include "ios/chrome/browser/infobars/confirm_infobar_controller.h"
 
 #include "base/mac/foundation_util.h"
 #include "base/strings/string_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "components/infobars/core/confirm_infobar_delegate.h"
@@ skipping 30 matching lines @@
 @interface ConfirmInfoBarController ()
 
 // Action for any of the user defined buttons.
 - (void)infoBarButtonDidPress:(id)sender;
 // Action for any of the user defined links.
 - (void)infobarLinkDidPress:(NSNumber*)tag;
 - (void)updateInfobarLabel:(UIView<InfoBarViewProtocol>*)view;
 @end
 
 @implementation ConfirmInfoBarController {
-  __weak ConfirmInfoBarDelegate* confirmInfobarDelegate_;
+  ConfirmInfoBarDelegate* confirmInfobarDelegate_;  // weak
 }
 
 #pragma mark -
 #pragma mark InfoBarController
 
 - (base::scoped_nsobject<UIView<InfoBarViewProtocol>>)
     viewForDelegate:(infobars::InfoBarDelegate*)delegate
               frame:(CGRect)frame {
   base::scoped_nsobject<UIView<InfoBarViewProtocol>> infoBarView;
   confirmInfobarDelegate_ = delegate->AsConfirmInfoBarDelegate();
@@ skipping 89 matching lines @@
   DCHECK([tag isKindOfClass:[NSNumber class]]);
   if (!self.delegate) {
     return;
   }
   if ([tag unsignedIntegerValue] == ConfirmInfoBarUITags::TITLE_LINK) {
     confirmInfobarDelegate_->LinkClicked(NEW_FOREGROUND_TAB);
   }
 }
 
 @end