Move SerializedScriptValue wire format version to public header

Source/bindings/v8/SerializedScriptValue.h

Index: Source/bindings/v8/SerializedScriptValue.h
diff --git a/Source/bindings/v8/SerializedScriptValue.h b/Source/bindings/v8/SerializedScriptValue.h
index b959ae158b51d29edeedf8e603ebadd52f3c2bd4..3de5644db34c36e6d87db3b4f13012adb9908a60 100644
--- a/Source/bindings/v8/SerializedScriptValue.h
+++ b/Source/bindings/v8/SerializedScriptValue.h
@@ -52,6 +52,10 @@ typedef Vector<RefPtr<WTF::ArrayBuffer>, 1> ArrayBufferArray;
 
 class SerializedScriptValue : public ThreadSafeRefCounted<SerializedScriptValue> {
 public:
+    // Increment this for each incompatible change to the wire format.
+    // Version 2: Added StringUCharTag for UChar v8 strings.
+    static const uint32_t wireFormatVersion = 2;
+
     virtual ~SerializedScriptValue();
 
     // If a serialization error occurs (e.g., cyclic input value) this
@@ -79,8 +83,6 @@ public:
     static PassRefPtr<SerializedScriptValue> numberValue(double);
     static PassRefPtr<SerializedScriptValue> numberValue(double, v8::Isolate*);
 
-    static uint32_t wireFormatVersion();
-
     PassRefPtr<SerializedScriptValue> release();
 
     String toWireString() const { return m_data; }