[ObjC ARC] Converts components/reading_list/ios:ios to ARC.

components/reading_list/ios/reading_list_model_bridge_observer.h

Index: components/reading_list/ios/reading_list_model_bridge_observer.h
diff --git a/components/reading_list/ios/reading_list_model_bridge_observer.h b/components/reading_list/ios/reading_list_model_bridge_observer.h
index 33a433ec5b27f99f1899159dae5c116d4808925c..e3f607452755511cc4ecd04508b82aaa4505c9b3 100644
--- a/components/reading_list/ios/reading_list_model_bridge_observer.h
+++ b/components/reading_list/ios/reading_list_model_bridge_observer.h
@@ -75,6 +75,8 @@ class ReadingListModelBridge : public ReadingListModelObserver {
                                   const GURL& url) override;
 
   __unsafe_unretained id<ReadingListModelBridgeObserver> observer_;
+
+  // TODO(crbug.com/729015): Refactor into strong pointer

[noyau (Ping after 24h), 2017/06/02 14:25:41]

not into strong pointer. It could be a weak one. I'd say "refactor to remove the
naked pointer."

   ReadingListModel* model_;  // weak
 
   DISALLOW_COPY_AND_ASSIGN(ReadingListModelBridge);