Port messages sent by WebIDBCursorImpl to Mojo.

content/child/indexed_db/indexed_db_database_callbacks_impl.h

Index: content/child/indexed_db/indexed_db_database_callbacks_impl.h
diff --git a/content/child/indexed_db/indexed_db_database_callbacks_impl.h b/content/child/indexed_db/indexed_db_database_callbacks_impl.h
index 67a239858c20c108df0f50fa218cdadd5d2ebd35..992bfaf899182e7ffcea0ae9de1f78ca10bff73d 100644
--- a/content/child/indexed_db/indexed_db_database_callbacks_impl.h
+++ b/content/child/indexed_db/indexed_db_database_callbacks_impl.h
@@ -13,14 +13,11 @@ class WebIDBDatabaseCallbacks;
 
 namespace content {
 
-class ThreadSafeSender;
-
 class IndexedDBDatabaseCallbacksImpl
     : public indexed_db::mojom::DatabaseCallbacks {
  public:
   explicit IndexedDBDatabaseCallbacksImpl(
-      std::unique_ptr<blink::WebIDBDatabaseCallbacks> callbacks,
-      scoped_refptr<ThreadSafeSender> thread_safe_sender);
+      std::unique_ptr<blink::WebIDBDatabaseCallbacks> callbacks);
   ~IndexedDBDatabaseCallbacksImpl() override;
 
   // indexed_db::mojom::DatabaseCallbacks implementation
@@ -33,7 +30,6 @@ class IndexedDBDatabaseCallbacksImpl
 
  private:
   scoped_refptr<base::SingleThreadTaskRunner> callback_runner_;
-  scoped_refptr<ThreadSafeSender> thread_safe_sender_;
   blink::WebIDBDatabaseCallbacks* callbacks_;
 
   DISALLOW_COPY_AND_ASSIGN(IndexedDBDatabaseCallbacksImpl);