Remove checks added to DocumentOrderList for crbug.com/699269 diagnosis

third_party/WebKit/Source/core/dom/DocumentOrderedList.h

Index: third_party/WebKit/Source/core/dom/DocumentOrderedList.h
diff --git a/third_party/WebKit/Source/core/dom/DocumentOrderedList.h b/third_party/WebKit/Source/core/dom/DocumentOrderedList.h
index 24c2f8fbfdf563e3676cb2e870c33cbe4cb33d3b..540c3d4335d43ce485122ff449bb49fd8981780f 100644
--- a/third_party/WebKit/Source/core/dom/DocumentOrderedList.h
+++ b/third_party/WebKit/Source/core/dom/DocumentOrderedList.h
@@ -42,32 +42,12 @@ class DocumentOrderedList final {
   DISALLOW_NEW();
 
  public:
-  DocumentOrderedList() : mutation_forbidden_(false) {}
-
-  // Forbids changes to DocumentOrderedList. Used to check if we are
-  // unintentionally changing DocumentOrderedList while iterating. Added for
-  // crbug.com/699269 diagnosis.
-  class MutationForbiddenScope final {
-    STACK_ALLOCATED();
-
-   public:
-    explicit MutationForbiddenScope(DocumentOrderedList* list) : list_(list) {
-      list_->mutation_forbidden_ = true;
-    }
-    ~MutationForbiddenScope() { list_->mutation_forbidden_ = false; }
-
-   private:
-    DocumentOrderedList* list_;
-  };
+  DocumentOrderedList() {}
 
   void Add(Node*);
   void Remove(const Node*);
   bool IsEmpty() const { return nodes_.IsEmpty(); }
-  void Clear() {
-    // TODO(keishi): CHECK() added for crbug.com/699269 diagnosis.
-    CHECK(!mutation_forbidden_);
-    nodes_.clear();
-  }
+  void Clear() { nodes_.clear(); }
   size_t size() const { return nodes_.size(); }
 
   using iterator = HeapListHashSet<Member<Node>, 32>::iterator;
@@ -87,7 +67,6 @@ class DocumentOrderedList final {
 
  private:
   HeapListHashSet<Member<Node>, 32> nodes_;
-  bool mutation_forbidden_;
 };
 
 }  // namespace blink