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

chrome/browser/invalidation/fake_invalidation_service.cc

Index: chrome/browser/invalidation/fake_invalidation_service.cc
diff --git a/chrome/browser/invalidation/fake_invalidation_service.cc b/chrome/browser/invalidation/fake_invalidation_service.cc
index 58e623c68dc7b4cffb85aa94259142a84ea9a86b..ef3176a93bb6169badbd75a6ac5095dcaa5543c0 100644
--- a/chrome/browser/invalidation/fake_invalidation_service.cc
+++ b/chrome/browser/invalidation/fake_invalidation_service.cc
@@ -26,10 +26,10 @@ void FakeInvalidationService::RegisterInvalidationHandler(
   invalidator_registrar_.RegisterHandler(handler);
 }
 
-void FakeInvalidationService::UpdateRegisteredInvalidationIds(
-      syncer::InvalidationHandler* handler,
-      const syncer::ObjectIdSet& ids) {
-  invalidator_registrar_.UpdateRegisteredIds(handler, ids);
+bool FakeInvalidationService::UpdateRegisteredInvalidationIds(
+    syncer::InvalidationHandler* handler,
+    const syncer::ObjectIdSet& ids) {
+  return invalidator_registrar_.UpdateRegisteredIds(handler, ids);
 }
 
 void FakeInvalidationService::UnregisterInvalidationHandler(