Removed false dependency from media on the file service interface

Removing this dependency will make extracting Motown from the Mojo
codebase significantly easier.

BUG=None
R=johngro@google.com

Review URL: https://codereview.chromium.org/1995013003 .
diff --git a/mojo/services/media/core/interfaces/seeking_reader.mojom b/mojo/services/media/core/interfaces/seeking_reader.mojom
index 0147612..f7a5ffd 100644
--- a/mojo/services/media/core/interfaces/seeking_reader.mojom
+++ b/mojo/services/media/core/interfaces/seeking_reader.mojom
@@ -5,7 +5,6 @@
 [DartPackage="mojo_services"]
 module mojo.media;
 
-import "mojo/services/files/interfaces/types.mojom";
 import "mojo/services/media/common/interfaces/media_common.mojom";
 
 // Reader with seek semantics.