Enable accessible name of a control to include multiple <label> elements.

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

Index: third_party/WebKit/Source/core/dom/TreeScope.h
diff --git a/third_party/WebKit/Source/core/dom/TreeScope.h b/third_party/WebKit/Source/core/dom/TreeScope.h
index 0522ee5fe736954cabe3b05c8c2ade9f75c5b843..ce83da53b39f5a1119775f440d9b9b5b91e99cb6 100644
--- a/third_party/WebKit/Source/core/dom/TreeScope.h
+++ b/third_party/WebKit/Source/core/dom/TreeScope.h
@@ -40,7 +40,6 @@ class ContainerNode;
 class DOMSelection;
 class Document;
 class Element;
-class HTMLLabelElement;
 class HTMLMapElement;
 class HitTestResult;
 class IdTargetObserverRegistry;
@@ -82,12 +81,6 @@ public:
     HeapVector<Member<Element>> elementsFromPoint(int x, int y) const;
     HeapVector<Member<Element>> elementsFromHitTestResult(HitTestResult&) const;
 
-    // For accessibility.
-    bool shouldCacheLabelsByForAttribute() const { return m_labelsByForAttribute; }
-    void addLabel(const AtomicString& forAttributeValue, HTMLLabelElement*);
-    void removeLabel(const AtomicString& forAttributeValue, HTMLLabelElement*);
-    HTMLLabelElement* labelElementForId(const AtomicString& forAttributeValue);
-
     DOMSelection* getSelection() const;
 
     Element* retarget(const Element& target) const;
@@ -138,7 +131,6 @@ private:
 
     Member<DocumentOrderedMap> m_elementsById;
     Member<DocumentOrderedMap> m_imageMapsByName;
-    Member<DocumentOrderedMap> m_labelsByForAttribute;
 
     Member<IdTargetObserverRegistry> m_idTargetObserverRegistry;