[Extensions] Expand bindings access checks

BUG=601149
BUG=601073

Review URL: https://codereview.chromium.org/1866103002

Cr-Commit-Position: refs/heads/master@{#387710}
void RenderFrameObserverNatives::Invalidate() {
  weak_ptr_factory_.InvalidateWeakPtrs();
  ObjectBackedNativeHandler::Invalidate();
}

void RenderFrameObserverNatives::Invalidate() {
  weak_ptr_factory_.InvalidateWeakPtrs();
  ObjectBackedNativeHandler::Invalidate();
}
