Moved serialization out of CRWSessionEntry.

ios/web/public/crw_navigation_manager_storage.h

Index: ios/web/public/crw_navigation_manager_storage.h
diff --git a/ios/web/public/crw_navigation_manager_storage.h b/ios/web/public/crw_navigation_manager_storage.h
index d1425d7122b4c172b29d871e0f188ea83c82e125..19c023b04511b10e332d07f3a7cad184b644816a 100644
--- a/ios/web/public/crw_navigation_manager_storage.h
+++ b/ios/web/public/crw_navigation_manager_storage.h
@@ -22,10 +22,7 @@
 @property(nonatomic, assign) NSInteger currentNavigationIndex;
 @property(nonatomic, assign) NSInteger previousNavigationIndex;
 @property(nonatomic, assign) NSTimeInterval lastVisitedTimestamp;
-// TODO(crbug.com/454984): |entries| currently contains CRWSessionEntries.  Once
-// NavigationItemImpls are encoded/decoded using CRWNavigationItemSerializations
-// (analogous to the approach taken with NavigationManager), this will
-// become an array of CRWNavigationItemSerializations.
+// |entries| is an NSArray of CRWNavigationItemStorages.
 @property(nonatomic, copy) NSArray* entries;
 @property(nonatomic, retain)
     CRWSessionCertificatePolicyManager* sessionCertificatePolicyManager;