Reland of land "media: Refactor MojoMediaClient" with fix.

chromecast/media/mojo/cast_mojo_media_client.h

+// Copyright 2016 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 CHROMECAST_MEDIA_MOJO_CAST_MOJO_MEDIA_CLIENT_H_
+#define CHROMECAST_MEDIA_MOJO_CAST_MOJO_MEDIA_CLIENT_H_
+
+#include "media/mojo/services/mojo_media_client.h"
+
+namespace chromecast {
+namespace media {
+
+class CastMojoMediaClient : public ::media::MojoMediaClient {
+ public:
+  CastMojoMediaClient();
+  ~CastMojoMediaClient() override;
+
+  static scoped_ptr<::media::MojoMediaClient> Create();
+
+  // MojoMediaClient overrides.
+  void Initialize() override;
+  scoped_ptr<::media::RendererFactory> CreateRendererFactory(
+      const scoped_refptr<::media::MediaLog>& media_log) override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(CastMojoMediaClient);
+};
+
+}  // namespace media
+}  // namespace chromecast
+
+#endif  // CHROMECAST_MEDIA_MOJO_CAST_MOJO_MEDIA_CLIENT_H_