Fix implicit access to raw pointer of scoped_refptr.

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index 087cd75e2a4adf3622d2a000c478cc7cb4e8a640..eb6917b267e8b61703aaa1df22079a369a10e63a 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -4351,10 +4351,10 @@ bool RenderFrameImpl::IsHidden() {
 }
 
 bool RenderFrameImpl::IsLocalRoot() const {
-  bool is_local_root = render_widget_ != nullptr;
+  bool is_local_root = static_cast<bool>(render_widget_);
   DCHECK_EQ(is_local_root,
             !(frame_->parent() && frame_->parent()->isWebLocalFrame()));
-  return render_widget_ != nullptr;
+  return is_local_root;
 }
 
 // Tell the embedding application that the URL of the active page has changed.