Fully migrate to Webrtc::Environment.

Telegram/SourceFiles/ui/controls/userpic_button.cpp

@@ -34,7 +34,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "media/streaming/media_streaming_player.h"
 #include "media/streaming/media_streaming_document.h"
 #include "settings/settings_calls.h" // Calls::AddCameraSubsection.
-#include "webrtc/webrtc_media_devices.h" // Webrtc::GetVideoInputList.
+#include "webrtc/webrtc_environment.h"
 #include "webrtc/webrtc_video_track.h"
 #include "ui/widgets/popup_menu.h"
 #include "window/window_controller.h"
@@ -53,7 +53,8 @@ namespace {
 
 [[nodiscard]] bool IsCameraAvailable() {
 	return (Core::App().calls().currentCall() == nullptr)
-		&& !Webrtc::GetVideoInputList().empty();
+		&& !Core::App().mediaDevices().defaultId(
+			Webrtc::DeviceType::Camera).isEmpty();
 }
 
 void CameraBox(