FIXUP: Restore GLX usage

Change-Id: I49e8ae6df08160f1cd7180a2cf601d15bceddcdb
Reviewed-on: https://codereview.qt-project.org/c/qt/qtwebengine-chromium/+/553830
Reviewed-by: Peter Varga <[email protected]>

Author: dfaure-kdab

chromium/ui/gl/gl_display.cc

@@ -36,6 +36,10 @@
 #include "base/android/build_info.h"
 #endif
 
+#if defined(USE_GLX)
+#include "ui/gfx/x/connection.h"
+#endif
+
 // From ANGLE's egl/eglext.h.
 
 #ifndef EGL_ANGLE_platform_angle