Revert of Deletes mojo::Callback

media/mojo/services/mojo_decryptor_service.h

Index: media/mojo/services/mojo_decryptor_service.h
diff --git a/media/mojo/services/mojo_decryptor_service.h b/media/mojo/services/mojo_decryptor_service.h
index 58dc7bc4af3f3d2de0bde47321ca62e917195494..8857346739b05f5012f19e506a30b58c61da57c7 100644
--- a/media/mojo/services/mojo_decryptor_service.h
+++ b/media/mojo/services/mojo_decryptor_service.h
@@ -10,13 +10,13 @@
 
 #include <unordered_map>
 
-#include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "media/base/decryptor.h"
 #include "media/mojo/interfaces/decryptor.mojom.h"
 #include "mojo/public/cpp/bindings/binding.h"
+#include "mojo/public/cpp/bindings/callback.h"
 #include "mojo/public/cpp/system/data_pipe.h"
 
 namespace media {
@@ -33,7 +33,7 @@
   // |error_handler| will be called if a connection error occurs.
   MojoDecryptorService(const scoped_refptr<MediaKeys>& cdm,
                        mojo::InterfaceRequest<mojom::Decryptor> request,
-                       const base::Closure& error_handler);
+                       const mojo::Closure& error_handler);
 
   ~MojoDecryptorService() final;