[Chromecast] Enable QUIC for Chromecast.

chromecast/browser/cast_browser_main_parts.cc

Index: chromecast/browser/cast_browser_main_parts.cc
diff --git a/chromecast/browser/cast_browser_main_parts.cc b/chromecast/browser/cast_browser_main_parts.cc
index d4046c2a97254423f95e77d573ec0f07393fb75c..8faf8dafde00b68d63b7b8c35f63801959419b83 100644
--- a/chromecast/browser/cast_browser_main_parts.cc
+++ b/chromecast/browser/cast_browser_main_parts.cc
@@ -479,6 +479,11 @@ void CastBrowserMainParts::PreMainMessageLoopRun() {
           cast_browser_process_->browser_context(),
           cast_browser_process_->pref_service(),
           url_request_context_factory_->GetSystemGetter(),
+          base::BindOnce(&URLRequestContextFactory::DisableQuic,
+                         // Safe since |url_request_context_factory_| is owned
+                         // by CastContentBrowserClient, which lives for the
+                         // entire lifetime of cast_shell.
+                         base::Unretained(url_request_context_factory_)),
           video_plane_controller_.get(), window_manager_.get()));
   cast_browser_process_->cast_service()->Initialize();