[Sync] InvalidationService shouldn't CHECK when registering ObjectId for more than one handler

components/invalidation/p2p_invalidator.h

Index: components/invalidation/p2p_invalidator.h
diff --git a/components/invalidation/p2p_invalidator.h b/components/invalidation/p2p_invalidator.h
index 3933d68d3a5ce305b6e9d5c122bcc8bfe102f8c0..b34c4a90108f72a7cb05c4701ebe4de2b9e6ca2f 100644
--- a/components/invalidation/p2p_invalidator.h
+++ b/components/invalidation/p2p_invalidator.h
@@ -102,7 +102,7 @@ class INVALIDATION_EXPORT_PRIVATE P2PInvalidator
 
   // Invalidator implementation.
   void RegisterHandler(InvalidationHandler* handler) override;
-  void UpdateRegisteredIds(InvalidationHandler* handler,
+  bool UpdateRegisteredIds(InvalidationHandler* handler,
                            const ObjectIdSet& ids) override;
   void UnregisterHandler(InvalidationHandler* handler) override;
   InvalidatorState GetInvalidatorState() const override;