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

Removing as the CHECKs were not triggered and bug was resolved.

BUG=699269

Review-Url: https://codereview.chromium.org/2850133003
Cr-Commit-Position: refs/heads/master@{#468311}

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

@@ -34,8 +34,6 @@
 namespace blink {
 
 void DocumentOrderedList::Add(Node* node) {
-  // TODO(keishi): CHECK() added for crbug.com/699269 diagnosis.
-  CHECK(!mutation_forbidden_);
   if (nodes_.IsEmpty()) {
     nodes_.insert(node);
     return;
@@ -62,8 +60,6 @@ void DocumentOrderedList::Add(Node* node) {
 }
 
 void DocumentOrderedList::Remove(const Node* node) {
-  // TODO(keishi): CHECK() added for crbug.com/699269 diagnosis.
-  CHECK(!mutation_forbidden_);
   nodes_.erase(const_cast<Node*>(node));
 }
 

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

third_party/WebKit/Source/core/dom/DocumentStyleSheetCollection.cpp

@@ -48,8 +48,6 @@ DocumentStyleSheetCollection::DocumentStyleSheetCollection(
 void DocumentStyleSheetCollection::CollectStyleSheetsFromCandidates(
     StyleEngine& master_engine,
     DocumentStyleSheetCollector& collector) {
-  DocumentOrderedList::MutationForbiddenScope mutation_forbidden_(
-      &style_sheet_candidate_nodes_);
   // TODO(keishi) Check added for crbug.com/699269 diagnosis. Remove once done.
   CHECK(HeapObjectHeader::FromPayload(this)->IsValid());
   CHECK(ThreadState::Current()->IsOnThreadHeap(this));