Task Scheduler API migration: change BrowserThreadModelWorker to SequencedModelWorker

components/sync/engine/passive_model_worker.h

Index: components/sync/engine/passive_model_worker.h
diff --git a/components/sync/engine/passive_model_worker.h b/components/sync/engine/passive_model_worker.h
index 11725df7e542e4c4533f34848503d3b4a1ab11cb..932966c6cd7df2f5f3690260160eb09382d891ac 100644
--- a/components/sync/engine/passive_model_worker.h
+++ b/components/sync/engine/passive_model_worker.h
@@ -11,15 +11,15 @@
 namespace syncer {
 
 // Implementation of ModelSafeWorker for passive types.  All work is
-// done on the same thread DoWorkAndWaitUntilDone (i.e., the sync
-// thread).
+// done on the same sequence DoWorkAndWaitUntilDone is called on (i.e. the same
+// sequence Sync runs on).
 class PassiveModelWorker : public ModelSafeWorker {
  public:
   PassiveModelWorker();
 
   // ModelSafeWorker implementation.
   ModelSafeGroup GetModelSafeGroup() override;
-  bool IsOnModelThread() override;
+  bool IsOnModelSequence() override;
 
  private:
   ~PassiveModelWorker() override;