Replace ConstNodeRange with a const_cast

content/browser/frame_host/frame_tree.cc

Index: content/browser/frame_host/frame_tree.cc
diff --git a/content/browser/frame_host/frame_tree.cc b/content/browser/frame_host/frame_tree.cc
index c3f130125c73748b721e94018d4acd2cce0c0426..702f225d93617a7666da3cd2f254c4ac7e7c4317 100644
--- a/content/browser/frame_host/frame_tree.cc
+++ b/content/browser/frame_host/frame_tree.cc
@@ -83,47 +83,6 @@ FrameTree::NodeRange::NodeRange(FrameTreeNode* root,
                                 FrameTreeNode* node_to_skip)
     : root_(root), node_to_skip_(node_to_skip) {}
 
-FrameTree::ConstNodeIterator::ConstNodeIterator(
-    const ConstNodeIterator& other) = default;
-
-FrameTree::ConstNodeIterator::~ConstNodeIterator() {}
-
-FrameTree::ConstNodeIterator& FrameTree::ConstNodeIterator::operator++() {
-  for (size_t i = 0; i < current_node_->child_count(); ++i) {
-    const FrameTreeNode* child = current_node_->child_at(i);
-    queue_.push(child);
-  }
-
-  if (!queue_.empty()) {
-    current_node_ = queue_.front();
-    queue_.pop();
-  } else {
-    current_node_ = nullptr;
-  }
-
-  return *this;
-}
-
-bool FrameTree::ConstNodeIterator::operator==(
-    const ConstNodeIterator& rhs) const {
-  return current_node_ == rhs.current_node_;
-}
-
-FrameTree::ConstNodeIterator::ConstNodeIterator(
-    const FrameTreeNode* starting_node)
-    : current_node_(starting_node) {}
-
-FrameTree::ConstNodeIterator FrameTree::ConstNodeRange::begin() {
-  return ConstNodeIterator(root_);
-}
-
-FrameTree::ConstNodeIterator FrameTree::ConstNodeRange::end() {
-  return ConstNodeIterator(nullptr);
-}
-
-FrameTree::ConstNodeRange::ConstNodeRange(const FrameTreeNode* root)
-    : root_(root) {}
-
 FrameTree::FrameTree(Navigator* navigator,
                      RenderFrameHostDelegate* render_frame_delegate,
                      RenderViewHostDelegate* render_view_delegate,
@@ -205,10 +164,6 @@ FrameTree::NodeRange FrameTree::NodesExcept(FrameTreeNode* node_to_skip) {
   return NodeRange(root_, node_to_skip);
 }
 
-FrameTree::ConstNodeRange FrameTree::ConstNodes() const {
-  return ConstNodeRange(root_);
-}
-
 bool FrameTree::AddFrame(
     FrameTreeNode* parent,
     int process_id,
@@ -478,7 +433,7 @@ void FrameTree::ResetLoadProgress() {
 }
 
 bool FrameTree::IsLoading() const {
-  for (const FrameTreeNode* node : ConstNodes()) {
+  for (const FrameTreeNode* node : const_cast<FrameTree*>(this)->Nodes()) {
     if (node->IsLoading())
       return true;
   }