Remove dead code from DocumentOrderedMap

Remove dead code from DocumentOrderedMap:
- clear() method is never used
- checkConsistency() is declared but unimplemented
- "wtf/HashCountedSet.h" include is no longer needed

R=esprehn, adamk

Review URL: https://codereview.chromium.org/138573003

git-svn-id: svn://svn.chromium.org/blink/trunk@165118 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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

@@ -61,11 +61,6 @@ inline bool keyMatchesLabelForAttribute(StringImpl* key, Element* element)
     return element->hasTagName(labelTag) && element->getAttribute(forAttr).impl() == key;
 }
 
-void DocumentOrderedMap::clear()
-{
-    m_map.clear();
-}
-
 void DocumentOrderedMap::add(StringImpl* key, Element* element)
 {
     ASSERT(key);

third_party/WebKit/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;