Revert of Deletes mojo::Callback

extensions/browser/api/mime_handler_private/mime_handler_private.h

 // Copyright 2015 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 EXTENSIONS_BROWSER_API_MIME_HANDLER_PRIVATE_MIME_HANDLER_PRIVATE_H_
 #define EXTENSIONS_BROWSER_API_MIME_HANDLER_PRIVATE_MIME_HANDLER_PRIVATE_H_
 
-#include "base/callback.h"
 #include "base/memory/weak_ptr.h"
 #include "extensions/common/api/mime_handler.mojom.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
 
 namespace extensions {
 class StreamContainer;
 class MimeHandlerServiceImplTest;
 
 class MimeHandlerServiceImpl : public mime_handler::MimeHandlerService {
  public:
   static void Create(
       base::WeakPtr<StreamContainer> stream_container,
       mojo::InterfaceRequest<mime_handler::MimeHandlerService> request);
 
  private:
   friend class MimeHandlerServiceImplTest;
 
   MimeHandlerServiceImpl(
       base::WeakPtr<StreamContainer> stream_container,
       mojo::InterfaceRequest<mime_handler::MimeHandlerService> request);
   ~MimeHandlerServiceImpl() override;
 
   // mime_handler::MimeHandlerService overrides.
-  void GetStreamInfo(const GetStreamInfoCallback& callback) override;
-  void AbortStream(const AbortStreamCallback& callback) override;
+  void GetStreamInfo(const mojo::Callback<void(mime_handler::StreamInfoPtr)>&
+                         callback) override;
+  void AbortStream(const mojo::Callback<void()>& callback) override;
 
   // Invoked by the callback used to abort |stream_|.
-  void OnStreamClosed(const AbortStreamCallback& callback);
+  void OnStreamClosed(const mojo::Callback<void()>& callback);
 
   // A handle to the stream being handled by the MimeHandlerViewGuest.
   base::WeakPtr<StreamContainer> stream_;
 
   mojo::StrongBinding<mime_handler::MimeHandlerService> binding_;
 
   base::WeakPtrFactory<MimeHandlerServiceImpl> weak_factory_;
 };
 
 }  // namespace extensions
 
 namespace mojo {
 
 template <>
 struct TypeConverter<extensions::mime_handler::StreamInfoPtr,
                      extensions::StreamContainer> {
   static extensions::mime_handler::StreamInfoPtr Convert(
       const extensions::StreamContainer& stream);
 };
 
 }  // namespace mojo
 
 #endif  // EXTENSIONS_BROWSER_API_MIME_HANDLER_PRIVATE_MIME_HANDLER_PRIVATE_H_