Remove dead code from DocumentOrderedMap

Source/core/dom/DocumentOrderedMap.h

Index: Source/core/dom/DocumentOrderedMap.h
diff --git a/Source/core/dom/DocumentOrderedMap.h b/Source/core/dom/DocumentOrderedMap.h
index 351e534d606ac60c8a6bb42bb35e8f43850c5de5..19c470ea0415c981d5850f87d087f6e9ab1886cc 100644
--- a/Source/core/dom/DocumentOrderedMap.h
+++ b/Source/core/dom/DocumentOrderedMap.h
@@ -31,7 +31,6 @@
 #ifndef DocumentOrderedMap_h
 #define DocumentOrderedMap_h
 
-#include "wtf/HashCountedSet.h"
 #include "wtf/HashMap.h"
 #include "wtf/Vector.h"
 #include "wtf/text/StringImpl.h"
@@ -45,7 +44,6 @@ class DocumentOrderedMap {
 public:
     void add(StringImpl*, Element*);
     void remove(StringImpl*, Element*);
-    void clear();
 
     bool contains(StringImpl*) const;
     bool containsMultiple(StringImpl*) const;
@@ -56,8 +54,6 @@ public:
     Element* getElementByLowercasedMapName(StringImpl*, const TreeScope*) const;
     Element* getElementByLabelForAttribute(StringImpl*, const TreeScope*) const;
 
-    void checkConsistency() const;
-
 private:
     template<bool keyMatches(StringImpl*, Element*)> Element* get(StringImpl*, const TreeScope*) const;