Fix "unused variable" warnings.

media/mojo/services/service_factory_impl.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 MEDIA_MOJO_SERVICES_SERVICE_FACTORY_IMPL_H_
 #define MEDIA_MOJO_SERVICES_SERVICE_FACTORY_IMPL_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 40 matching lines @@
 #endif  // defined(ENABLE_MOJO_RENDERER)
 
 #if defined(ENABLE_MOJO_CDM)
   CdmFactory* GetCdmFactory();
 
   std::unique_ptr<CdmFactory> cdm_factory_;
 #endif  // defined(ENABLE_MOJO_CDM)
 
   MojoCdmServiceContext cdm_service_context_;
   mojo::StrongBinding<mojom::ServiceFactory> binding_;
+#if defined(ENABLE_MOJO_CDM)
   shell::mojom::InterfaceProvider* interfaces_;
+#endif
+#if defined(ENABLE_MOJO_AUDIO_DECODER) || defined(ENABLE_MOJO_CDM) || \
+    defined(ENABLE_MOJO_RENDERER)
+  MojoMediaClient* mojo_media_client_;
+#endif
   scoped_refptr<MediaLog> media_log_;
   std::unique_ptr<shell::ShellConnectionRef> connection_ref_;
-  MojoMediaClient* mojo_media_client_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceFactoryImpl);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_MOJO_SERVICES_SERVICE_FACTORY_IMPL_H_