Move SerializedScriptValue wire format version to public header

public/web/WebSerializedScriptValueVersion.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 10 matching lines @@
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include "config.h"
-#include "public/web/WebScriptBindings.h"
-
-#include "bindings/v8/V8Binding.h"
-#include "public/platform/WebString.h"
-
-using namespace WebCore;
+#ifndef WebSerializedScriptValueVersion_h
+#define WebSerializedScriptValueVersion_h
 
 namespace WebKit {
 
-v8::Local<v8::String> WebScriptBindings::toV8String(const WebString& string, v8::Isolate* isolate)
-{
-    return v8String(string, isolate);
-}
-
-WebString WebScriptBindings::toWebString(v8::Handle<v8::String> v8String)
-{
-    return v8StringToWebCoreString<String>(v8String, Externalize);
-}
+// SerializedScriptValue wire format version. Versions higher than
+// this value will not be deserializable by WebSerializedScriptValue.
+// Embedders may serialize this as out-of-band metadata along with
+// collections of serialized data so that version skew can be detected
+// before deserializing individual values.
+const unsigned kSerializedScriptValueVersion = 2;
 
 } // namespace WebKit
+
+#endif // WebSerializedScriptValueVersion_h