[scenic] Use C++ structured bindings with scenic::NewViewTokenPair().

Change-Id: Ib5e1639faa37721ab61586878216b461599447b8
diff --git a/examples/mediaplayer/mediaplayer_skia/mediaplayer_view.cc b/examples/mediaplayer/mediaplayer_skia/mediaplayer_view.cc
index 941e8a4..4a60c38 100644
--- a/examples/mediaplayer/mediaplayer_skia/mediaplayer_view.cc
+++ b/examples/mediaplayer/mediaplayer_skia/mediaplayer_view.cc
@@ -80,12 +80,12 @@
         HandleStatusChanged(status);
       };
 
-  auto view_tokens = scenic::NewViewTokenPair();
+  auto [view_token, view_holder_token] = scenic::NewViewTokenPair();
 
-  player_->CreateView2(std::move(view_tokens.first.value));
+  player_->CreateView2(std::move(view_token.value));
 
   video_host_view_holder_ = std::make_unique<scenic::ViewHolder>(
-      session(), std::move(view_tokens.second), "Player");
+      session(), std::move(view_holder_token), "Player");
   video_host_node_ = std::make_unique<scenic::EntityNode>(session());
   video_host_node_->Attach(*video_host_view_holder_);