LayerTreeHostImpl knows if it has an output surface.

cc/output/delegating_renderer.cc

Index: cc/output/delegating_renderer.cc
diff --git a/cc/output/delegating_renderer.cc b/cc/output/delegating_renderer.cc
index 206c05c5110bc22b0c7c8060ad18c1045f2757c1..143596bf5d2d0173680ccd6664b9aab4e9bbb4ae 100644
--- a/cc/output/delegating_renderer.cc
+++ b/cc/output/delegating_renderer.cc
@@ -112,13 +112,6 @@ void DelegatingRenderer::ReceiveSwapBuffersAck(
   resource_provider_->ReceiveReturnsFromParent(ack.resources);
 }
 
-bool DelegatingRenderer::IsContextLost() {
-  ContextProvider* context_provider = output_surface_->context_provider();
-  if (!context_provider)
-    return false;
-  return context_provider->IsContextLost();
-}
-
 void DelegatingRenderer::DidChangeVisibility() {
   ContextProvider* context_provider = output_surface_->context_provider();
   if (!visible()) {