Revert of Deletes mojo::Callback

media/mojo/services/mojo_cdm_promise.h

Index: media/mojo/services/mojo_cdm_promise.h
diff --git a/media/mojo/services/mojo_cdm_promise.h b/media/mojo/services/mojo_cdm_promise.h
index 0d82b2b9cea573ca22feca82d374e9fecef5b7f2..c380863adcffccb47b09c4c8b69ac13aa8ae5a58 100644
--- a/media/mojo/services/mojo_cdm_promise.h
+++ b/media/mojo/services/mojo_cdm_promise.h
@@ -7,19 +7,19 @@
 
 #include <stdint.h>
 
-#include "base/callback.h"
 #include "base/macros.h"
 #include "media/base/cdm_promise.h"
 #include "media/mojo/common/mojo_type_trait.h"
 #include "media/mojo/interfaces/content_decryption_module.mojom.h"
+#include "mojo/public/cpp/bindings/callback.h"
 
 namespace media {
 
-// media::CdmPromiseTemplate implementations backed by base::Callbacks.
+// media::CdmPromiseTemplate implementations backed by mojo::Callbacks.
 template <typename... T>
 class MojoCdmPromise : public CdmPromiseTemplate<T...> {
  public:
-  typedef base::Callback<void(mojom::CdmPromiseResultPtr,
+  typedef mojo::Callback<void(mojom::CdmPromiseResultPtr,
                               typename MojoTypeTrait<T>::MojoType...)>
       CallbackType;