Simplify AtomicStringTable and remove lots of dead code.

third_party/WebKit/Source/wtf/text/AtomicString.h

Index: third_party/WebKit/Source/wtf/text/AtomicString.h
diff --git a/third_party/WebKit/Source/wtf/text/AtomicString.h b/third_party/WebKit/Source/wtf/text/AtomicString.h
index ec4782b141baff281af5fc8f7b7983274655e4da..7345d827ab8fca6edbb485dad54be5dd05b369e2 100644
--- a/third_party/WebKit/Source/wtf/text/AtomicString.h
+++ b/third_party/WebKit/Source/wtf/text/AtomicString.h
@@ -45,7 +45,6 @@ public:
         : AtomicString(reinterpret_cast<const LChar*>(chars)) {}
     AtomicString(const LChar* chars, unsigned length);
     AtomicString(const UChar* chars, unsigned length);
-    AtomicString(const UChar* chars, unsigned length, unsigned existingHash);
     AtomicString(const UChar* chars);
 
     template<size_t inlineCapacity>
@@ -57,8 +56,6 @@ public:
     explicit AtomicString(StringImpl* impl) : m_string(add(impl)) { }
     explicit AtomicString(const String& s) : m_string(add(s.impl())) { }
 
-    AtomicString(StringImpl* baseString, unsigned start, unsigned length);
-
     // Hash table deleted values, which are only constructed and never copied or destroyed.
     AtomicString(WTF::HashTableDeletedValueType) : m_string(WTF::HashTableDeletedValue) { }
     bool isHashTableDeletedValue() const { return m_string.isHashTableDeletedValue(); }