Simplify AtomicStringTable and remove lots of dead code.

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WTF_AtomicStringTable_h
 #define WTF_AtomicStringTable_h
 
 #include "wtf/Allocator.h"
 #include "wtf/HashSet.h"
 #include "wtf/WTFExport.h"
@@ skipping 13 matching lines @@
     ~AtomicStringTable();
 
     // Gets the shared table for the current thread.
     static AtomicStringTable& instance()
     {
         return wtfThreadData().getAtomicStringTable();
     }
 
     // Used by system initialization to preallocate enough storage for all of
     // the static strings.
-    void reserveCapacity(unsigned);
+    void reserveCapacity(unsigned size);
 
-    // Adding a StringImpl.
+    // Inserting strings into the table. Note that the return value from adding
+    // a UChar string may be an LChar string as the table will attempt to
+    // convert the string to save memory if possible.
     StringImpl* add(StringImpl*);
-    PassRefPtr<StringImpl> add(StringImpl*, unsigned offset, unsigned length);
-
-    // Adding an LChar.
-    PassRefPtr<StringImpl> add(const LChar*, unsigned length);
-
-    // Adding a UChar.
-    PassRefPtr<StringImpl> add(const UChar*, unsigned length);
-    PassRefPtr<StringImpl> add(const UChar*, unsigned length, unsigned existingHash);
-    PassRefPtr<StringImpl> add(const UChar*);
+    PassRefPtr<StringImpl> add(const LChar* chars, unsigned length);
+    PassRefPtr<StringImpl> add(const UChar* chars, unsigned length);
 
     // Adding UTF8.
     // Returns null if the characters contain invalid utf8 sequences.
     // Pass null for the charactersEnd to automatically detect the length.
     PassRefPtr<StringImpl> addUTF8(const char* charactersStart, const char* charactersEnd);
 
     // This is for ~StringImpl to unregister a string before destruction since
     // the table is holding weak pointers. It should not be used directly.
     void remove(StringImpl*);
 
 private:
     template<typename T, typename HashTranslator>
     inline PassRefPtr<StringImpl> addToStringTable(const T& value);
 
-    template<typename CharacterType>
-    inline HashSet<StringImpl*>::iterator find(const StringImpl*);
-
     HashSet<StringImpl*> m_table;
 };
 
 } // namespace WTF
 
 using WTF::AtomicStringTable;
 
 #endif