[ObjC ARC] Converts ios/chrome/browser/ui/omnibox:omnibox_internal to ARC.

ios/chrome/browser/ui/omnibox/page_info_view_controller.h

 // Copyright (c) 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.
 
 #ifndef IOS_CHROME_BROWSER_UI_OMNIBOX_PAGE_INFO_VIEW_CONTROLLER_H_
 #define IOS_CHROME_BROWSER_UI_OMNIBOX_PAGE_INFO_VIEW_CONTROLLER_H_
 
 #import <UIKit/UIKit.h>
 
 #include <memory>
@@ skipping 35 matching lines @@
 
   // PageInfoModelObserver implementation.
   void OnPageInfoModelChanged() override;
 
   // Sets the controller.
   void set_controller(PageInfoViewController* controller) {
     controller_ = controller;
   }
 
  private:
-  void PerformLayout() {
-    // If the window is animating closed when this is called, the
-    // animation could be holding the last reference to |controller_|
-    // (and thus |this|).  Pin it until the task is completed.
-    base::scoped_nsobject<PageInfoViewController> keep_alive(
-        [controller_ retain]);
-    [controller_ performLayout];
-  }
+  void PerformLayout();
 
-  PageInfoViewController* controller_;  // weak
+  __unsafe_unretained PageInfoViewController* controller_;
 
   base::WeakPtrFactory<PageInfoModelBubbleBridge> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PageInfoModelBubbleBridge);
 };
 
 #endif  // IOS_CHROME_BROWSER_UI_OMNIBOX_PAGE_INFO_VIEW_CONTROLLER_H_