Make MediaSession available on Desktop

content/browser/BUILD.gn

Index: content/browser/BUILD.gn
diff --git a/content/browser/BUILD.gn b/content/browser/BUILD.gn
index 673c9687cddc98490812dab7d607757202c4b6f4..aa215f486b0b813f204198a0a56793306e131c80 100644
--- a/content/browser/BUILD.gn
+++ b/content/browser/BUILD.gn
@@ -790,16 +790,12 @@ source_set("browser") {
     "manifest/manifest_manager_host.h",
     "media/android/browser_media_player_manager.cc",
     "media/android/browser_media_player_manager.h",
-    "media/android/browser_media_session_manager.cc",
-    "media/android/browser_media_session_manager.h",
     "media/android/browser_surface_view_manager.cc",
     "media/android/browser_surface_view_manager.h",
     "media/android/media_player_renderer.cc",
     "media/android/media_player_renderer.h",
     "media/android/media_resource_getter_impl.cc",
     "media/android/media_resource_getter_impl.h",
-    "media/android/media_session_service_impl.cc",
-    "media/android/media_session_service_impl.h",
     "media/android/media_throttler.cc",
     "media/android/media_throttler.h",
     "media/android/media_web_contents_observer_android.cc",
@@ -853,6 +849,8 @@ source_set("browser") {
     "media/midi_host.h",
     "media/session/audio_focus_manager.cc",
     "media/session/audio_focus_manager.h",
+    "media/session/media_metadata_sanitizer.cc",
+    "media/session/media_metadata_sanitizer.h",
     "media/session/media_session.cc",
     "media/session/media_session.h",
     "media/session/media_session_controller.cc",
@@ -864,6 +862,8 @@ source_set("browser") {
     "media/session/media_session_delegate_android.h",
     "media/session/media_session_delegate_default.cc",
     "media/session/media_session_observer.h",
+    "media/session/media_session_service_impl.cc",
+    "media/session/media_session_service_impl.h",
     "media/session/media_session_uma_helper.cc",
     "media/session/media_session_uma_helper.h",
     "memory/memory_coordinator.cc",