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

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

Index: ios/chrome/browser/ui/omnibox/page_info_view_controller.h
diff --git a/ios/chrome/browser/ui/omnibox/page_info_view_controller.h b/ios/chrome/browser/ui/omnibox/page_info_view_controller.h
index 8965ea21233bf5886d7526f7682ab921893fa0eb..50fb2307bc1ec7a0e7d1955cdf0cca3b94f3b2dc 100644
--- a/ios/chrome/browser/ui/omnibox/page_info_view_controller.h
+++ b/ios/chrome/browser/ui/omnibox/page_info_view_controller.h
@@ -53,16 +53,9 @@ class PageInfoModelBubbleBridge : public PageInfoModelObserver {
   }
 
  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_;