Bug 1546343 - Enable hi-res widget rendering for X11 r=stransky

The code also works for X11, so no reasons to keep it just for Wayland

Differential Revision: https://phabricator.services.mozilla.com/D32323

--HG--
extra : moz-landing-system : lando

widget/gtk/nsNativeThemeGTK.cpp

@@ -866,9 +866,8 @@ static void DrawThemeWithCairo(gfxContext* aContext, DrawTarget* aDrawTarget,
   static auto sCairoSurfaceSetDeviceScalePtr =
       (void (*)(cairo_surface_t*, double, double))dlsym(
           RTLD_DEFAULT, "cairo_surface_set_device_scale");
-  // Support HiDPI widget styles on Wayland only for now.
-  bool useHiDPIWidgets = !isX11Display && (aScaleFactor != 1) &&
-                         (sCairoSurfaceSetDeviceScalePtr != nullptr);
+  bool useHiDPIWidgets =
+      (aScaleFactor != 1) && (sCairoSurfaceSetDeviceScalePtr != nullptr);
 
   Point drawOffsetScaled;
   Point drawOffsetOriginal;