Bug 1680128 - Do not flip surface when not using native compositor, r=mstange

Differential Revision: https://phabricator.services.mozilla.com/D110398

gfx/webrender_bindings/RenderCompositorNative.cpp

@@ -60,7 +60,6 @@ bool RenderCompositorNative::BeginFrame() {
     if (!mNativeLayerForEntireWindow) {
       mNativeLayerForEntireWindow =
           mNativeLayerRoot->CreateLayer(bufferSize, false, mSurfacePoolHandle);
-      mNativeLayerForEntireWindow->SetSurfaceIsFlipped(true);
       mNativeLayerRoot->AppendLayer(mNativeLayerForEntireWindow);
     }
   }