diff -up chromium-56.0.2924.87/third_party/webrtc/modules/desktop_capture/screen_capturer_x11.cc.gcc49 chromium-56.0.2924.87/third_party/webrtc/modules/desktop_capture/screen_capturer_x11.cc
--- chromium-56.0.2924.87/third_party/webrtc/modules/desktop_capture/screen_capturer_x11.cc.gcc49	2017-02-13 11:41:35.563497836 -0500
+++ chromium-56.0.2924.87/third_party/webrtc/modules/desktop_capture/screen_capturer_x11.cc	2017-02-13 11:42:43.608161336 -0500
@@ -412,7 +412,7 @@ std::unique_ptr<DesktopCapturer> Desktop
     return nullptr;
   }
 
-  return capturer;
+  return std::move(capturer);
 }
 
 }  // namespace webrtc