Remove unused DictionaryBuilder::createString

Source/bindings/modules/v8/custom/V8CryptoKeyCustom.cpp

 // Copyright 2014 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.
 
 #include "config.h"
 #include "bindings/modules/v8/V8CryptoKey.h"
 
 #include "bindings/core/v8/Dictionary.h"
 #include "bindings/core/v8/V8Binding.h"
 #include "bindings/core/v8/custom/V8Uint8ArrayCustom.h"
@@ skipping 32 matching lines @@
 
     virtual void setUint8Array(const char* propertyName, const blink::WebVector<unsigned char>& vector)
     {
         RefPtr<Uint8Array> uint8Array = Uint8Array::create(vector.data(), vector.size());
         m_dictionary.set(propertyName, toV8(uint8Array.get(), m_holder, m_isolate));
     }
 
     const Dictionary& dictionary() const { return m_dictionary; }
 
 private:
-    v8::Local<v8::String> createString(const char* utf8CString)
-    {
-        return v8::String::NewFromUtf8(m_isolate, utf8CString);
-    }
-
     v8::Handle<v8::Object> m_holder;
     v8::Isolate* m_isolate;
     Dictionary m_dictionary;
 };
 
 void V8CryptoKey::algorithmAttributeGetterCustom(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     CryptoKey* impl = V8CryptoKey::toNative(info.Holder());
 
     DictionaryBuilder builder(info.Holder(), info.GetIsolate());
     impl->key().algorithm().writeToDictionary(&builder);
 
     v8SetReturnValue(info, builder.dictionary().v8Value());
 }
 
 } // namespace WebCore