Extract MediaListDirective and SourceListDirective from ContentSecurityPolicy.

Source/core/frame/csp/CSPDirective.h

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CSPDirective_h
+#define CSPDirective_h
+
+#include "wtf/text/WTFString.h"
+
+namespace WebCore {
+
+class ContentSecurityPolicy;
+class KURL;
+
+class CSPDirective {
+    WTF_MAKE_NONCOPYABLE(CSPDirective);
+public:
+    CSPDirective(const String& name, const String& value, ContentSecurityPolicy* policy)
+        : m_name(name)
+        , m_text(name + ' ' + value)
+        , m_policy(policy)
+    {
+    }
+
+    const String& text() const { return m_text; }
+
+protected:
+    const ContentSecurityPolicy* policy() const { return m_policy; }
+
+private:
+    String m_name;
+    String m_text;
+    ContentSecurityPolicy* m_policy;
+};
+
+} // namespace WebCore
+
+#endif