Reland of Use spec-compliant algorithm to select video devices in getUserMedia.

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index 264c934af1782382c8593f714d7f9529d2fcca55..8867e039a1abc45a5768971c5de0a860dad3e744 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -6130,14 +6130,16 @@ void RenderFrameImpl::SyncSelectionIfRequired() {
 }
 
 void RenderFrameImpl::InitializeUserMediaClient() {
-  if (!RenderThreadImpl::current())  // Will be NULL during unit tests.
+  RenderThreadImpl* render_thread = RenderThreadImpl::current();
+  if (!render_thread)  // Will be NULL during unit tests.
     return;
 
 #if BUILDFLAG(ENABLE_WEBRTC)
   DCHECK(!web_user_media_client_);
   web_user_media_client_ = new UserMediaClientImpl(
       this, RenderThreadImpl::current()->GetPeerConnectionDependencyFactory(),
-      base::MakeUnique<MediaStreamDispatcher>(this));
+      base::MakeUnique<MediaStreamDispatcher>(this),
+      render_thread->GetWorkerTaskRunner());
   GetInterfaceRegistry()->AddInterface(
       base::Bind(&MediaDevicesListenerImpl::Create, GetRoutingID()));
 #endif