[IndexedDB] Refactoring to remove ref ptrs and host transaction ids.

content/browser/indexed_db/cursor_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_BROWSER_INDEXED_DB_CURSOR_IMPL_H_
 #define CONTENT_BROWSER_INDEXED_DB_CURSOR_IMPL_H_
 
+#include <memory>
+
 #include "base/memory/ref_counted.h"
 #include "content/common/indexed_db/indexed_db.mojom.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 }
 
 namespace content {
 
 class IndexedDBCursor;
 class IndexedDBDispatcherHost;
 class IndexedDBKey;
 
 class CursorImpl : public ::indexed_db::mojom::Cursor {
  public:
-  CursorImpl(scoped_refptr<IndexedDBCursor> cursor,
+  CursorImpl(std::unique_ptr<IndexedDBCursor> cursor,
              const url::Origin& origin,
              scoped_refptr<IndexedDBDispatcherHost> dispatcher_host);
   ~CursorImpl() override;
 
   // ::indexed_db::mojom::Cursor implementation
   void Advance(
       uint32_t count,
       ::indexed_db::mojom::CallbacksAssociatedPtrInfo callbacks) override;
   void Continue(
       const IndexedDBKey& key,
@@ skipping 14 matching lines @@
   scoped_refptr<IndexedDBDispatcherHost> dispatcher_host_;
   const url::Origin origin_;
   scoped_refptr<base::SingleThreadTaskRunner> idb_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(CursorImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_INDEXED_DB_CURSOR_IMPL_H_