Add forEach() to CSSVariablesMap

Source/core/css/CSSVariablesMapForEachCallback.h

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-#ifndef ScriptString_h
-#define ScriptString_h
+#ifndef CSSVariablesMapForEachCallback_h
+#define CSSVariablesMapForEachCallback_h
 
 #include "bindings/v8/ScriptValue.h"
-#include "bindings/v8/V8Binding.h"
+#include "wtf/RefCounted.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
-class ScriptString : public ScriptValue {
+class CSSVariablesMap;
+
+class CSSVariablesMapForEachCallback : public RefCounted<CSSVariablesMapForEachCallback> {
 public:
-    ScriptString() { }
-    ScriptString(v8::Handle<v8::String> value, v8::Isolate* isolate) : ScriptValue(value, isolate) { }
-
-    ScriptString concatenateWith(const String&);
-    String flattenToString() const;
+    virtual ~CSSVariablesMapForEachCallback() { }
+    virtual bool handleItem(ScriptValue thisValue, const String& value, const String& name, CSSVariablesMap*) = 0;
+    virtual bool handleItem(const String& value, const String& name, CSSVariablesMap*) = 0;
 };
 
 } // namespace WebCore
 
-#endif // ScriptString_h
+#endif // CSSVariablesMapForEachCallback_h