Remove the legacy fullscreen video path in Android.

content/browser/media/android/browser_media_player_manager.cc

Index: content/browser/media/android/browser_media_player_manager.cc
diff --git a/content/browser/media/android/browser_media_player_manager.cc b/content/browser/media/android/browser_media_player_manager.cc
index 5b9523e55a6f6b2c5e9ecb0195d3dfe97a52b092..d0a5f3da715bf8153998924ff8b05c41d630d183 100644
--- a/content/browser/media/android/browser_media_player_manager.cc
+++ b/content/browser/media/android/browser_media_player_manager.cc
@@ -171,13 +171,10 @@ void BrowserMediaPlayerManager::FullscreenPlayerSeek(int msec) {
 void BrowserMediaPlayerManager::ExitFullscreen(bool release_media_player) {
   if (WebContentsDelegate* delegate = web_contents_->GetDelegate())
     delegate->ToggleFullscreenModeForTab(web_contents_, false);
-  if (!CommandLine::ForCurrentProcess()->HasSwitch(
-      switches::kDisableOverlayFullscreenVideoSubtitle)) {
-    if (RenderWidgetHostViewAndroid* view_android =
-        static_cast<RenderWidgetHostViewAndroid*>(
-            web_contents_->GetRenderWidgetHostView())) {
-      view_android->SetOverlayVideoMode(false);
-    }
+  if (RenderWidgetHostViewAndroid* view_android =
+      static_cast<RenderWidgetHostViewAndroid*>(
+          web_contents_->GetRenderWidgetHostView())) {
+    view_android->SetOverlayVideoMode(false);
   }
 
   Send(
@@ -213,10 +210,6 @@ void BrowserMediaPlayerManager::SetVideoSurface(
     return;
 
   Send(new MediaPlayerMsg_DidEnterFullscreen(RoutingID(), player->player_id()));
-  if (CommandLine::ForCurrentProcess()->HasSwitch(
-      switches::kDisableOverlayFullscreenVideoSubtitle)) {
-    return;
-  }
   if (RenderWidgetHostViewAndroid* view_android =
       static_cast<RenderWidgetHostViewAndroid*>(
           web_contents_->GetRenderWidgetHostView())) {