diff --git a/gfx/webrender_bindings/webrender_ffi.h b/gfx/webrender_bindings/webrender_ffi.h
--- a/gfx/webrender_bindings/webrender_ffi.h
+++ b/gfx/webrender_bindings/webrender_ffi.h
@@ -68,18 +68,16 @@ struct InternerSubReport {
 struct Transaction;
 struct WrWindowId;
 struct DocumentId;
 struct WrPipelineInfo;
 
 struct WrPipelineIdAndEpoch;
 using WrPipelineIdEpochs = nsTArray<WrPipelineIdAndEpoch>;
 
-const uint64_t ROOT_CLIP_CHAIN = ~0;
-
 }  // namespace wr
 }  // namespace mozilla
 
 void apz_register_updater(mozilla::wr::WrWindowId aWindowId);
 void apz_pre_scene_swap(mozilla::wr::WrWindowId aWindowId);
 void apz_post_scene_swap(mozilla::wr::WrWindowId aWindowId,
                          const mozilla::wr::WrPipelineInfo* aInfo);
 void apz_run_updater(mozilla::wr::WrWindowId aWindowId);