Port messages sent by WebIDBCursorImpl to Mojo.

content/child/indexed_db/indexed_db_database_callbacks_impl.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_CHILD_INDEXED_DB_INDEXED_DB_DATABASE_CALLBACKS_IMPL_H_
 #define CONTENT_CHILD_INDEXED_DB_INDEXED_DB_DATABASE_CALLBACKS_IMPL_H_
 
 #include "content/common/indexed_db/indexed_db.mojom.h"
 
 namespace blink {
 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
   void ForcedClose() override;
   void VersionChange(int64_t old_version, int64_t new_version) override;
   void Abort(int64_t transaction_id,
              int32_t code,
              const base::string16& message) override;
   void Complete(int64_t transaction_id) override;
 
  private:
   scoped_refptr<base::SingleThreadTaskRunner> callback_runner_;
-  scoped_refptr<ThreadSafeSender> thread_safe_sender_;
   blink::WebIDBDatabaseCallbacks* callbacks_;
 
   DISALLOW_COPY_AND_ASSIGN(IndexedDBDatabaseCallbacksImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_INDEXED_DB_INDEXED_DB_DATABASE_CALLBACKS_IMPL_H_