Add forEach() to CSSVariablesMap

Source/core/css/CSSVariablesIterator.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
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-#ifndef StorageQuotaCallback_h
-#define StorageQuotaCallback_h
+#ifndef CSSVariablesIterator_h
+#define CSSVariablesIterator_h
 
 #include "wtf/RefCounted.h"
 
 namespace WebCore {
 
-class StorageQuotaCallback : public RefCounted<StorageQuotaCallback> {
+class CSSVariablesIterator : public RefCounted<CSSVariablesIterator> {
 public:
-    virtual ~StorageQuotaCallback() { }
-    virtual bool handleEvent(unsigned long long grantedQuotaInBytes) = 0;
+    virtual ~CSSVariablesIterator() { }
+    virtual void advance() = 0;
+    virtual bool atEnd() const = 0;
+    virtual AtomicString name() const = 0;
+    virtual String value() const = 0;
+    virtual void addedVariable(const AtomicString& name) { }
+    virtual void removedVariable(const AtomicString& name) { }
+    virtual void clearedVariables() { }
 };
 
-} // namespace
+}
 
-#endif // StorageQuotaCallback_h
+#endif // CSSVariablesIterator_h