Move btoa() / atob() implementation out of DOMWindow

Source/core/page/DOMWindowBase64.h

Index: Source/core/page/DOMWindowBase64.h
diff --git a/Source/bindings/v8/ScriptString.h b/Source/core/page/DOMWindowBase64.h
similarity index 76%
copy from Source/bindings/v8/ScriptString.h
copy to Source/core/page/DOMWindowBase64.h
index 14467c7eb9feb0e4c7780ef86d013820b5f2174f..50b79721cfb415ea811843e4b097275b293d6ad7 100644
--- a/Source/bindings/v8/ScriptString.h
+++ b/Source/core/page/DOMWindowBase64.h
@@ -1,5 +1,7 @@
 /*
- * Copyright (C) 2013 Google Inc. All rights reserved.
+ * Copyright (C) 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
+ * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
+ * Copyright (C) 2013 Samsung Electronics. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
@@ -28,24 +30,19 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef ScriptString_h
-#define ScriptString_h
+#ifndef DOMWindowBase64_h
+#define DOMWindowBase64_h
 
-#include "bindings/v8/ScriptValue.h"
-#include "bindings/v8/V8Binding.h"
+#include "core/dom/ExceptionCode.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
-class ScriptString : public ScriptValue {
-public:
-    ScriptString() { }
-    explicit ScriptString(v8::Handle<v8::String> value) : ScriptValue(value) { }
-
-    ScriptString concatenateWith(const String&);
-    String flattenToString() const;
-};
+namespace DOMWindowBase64 {
+String btoa(void*, const String& stringToEncode, ExceptionCode&);
+String atob(void*, const String& encodedString, ExceptionCode&);
+}
 
 } // namespace WebCore
 
-#endif // ScriptString_h
+#endif // DOMWindowBase64_h