Bug 1012198: Allow BasicCompositor to be used on windows. r=BenWa

widget/xpwidgets/nsBaseWidget.cpp

@@ -874,6 +874,7 @@ nsBaseWidget::GetPreferredCompositorBackends(nsTArray<LayersBackend>& aHints)
 static void
 CheckForBasicBackends(nsTArray<LayersBackend>& aHints)
 {
+#ifndef XP_WIN
   for (size_t i = 0; i < aHints.Length(); ++i) {
     if (aHints[i] == LayersBackend::LAYERS_BASIC &&
         !Preferences::GetBool("layers.offmainthreadcomposition.force-basic", false)) {
@@ -881,6 +882,7 @@ CheckForBasicBackends(nsTArray<LayersBackend>& aHints)
       aHints[i] = LayersBackend::LAYERS_NONE;
     }
   }
+#endif
 }
 
 void nsBaseWidget::CreateCompositor(int aWidth, int aHeight)