Let ContentSecurityPolicy shared between imports and the master.

Source/core/dom/SecurityContext.h

 /*
  * Copyright (C) 2011 Google Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 35 matching lines @@
 
     // Explicitly override the security origin for this security context.
     // Note: It is dangerous to change the security origin of a script context
     //       that already contains content.
     void setSecurityOrigin(PassRefPtr<SecurityOrigin>);
 
 protected:
     SecurityContext();
     virtual ~SecurityContext();
 
-    void setContentSecurityPolicy(PassOwnPtr<ContentSecurityPolicy>);
+    void setContentSecurityPolicy(PassRefPtr<ContentSecurityPolicy>);
 
     void didFailToInitializeSecurityOrigin() { m_haveInitializedSecurityOrigin = false; }
     bool haveInitializedSecurityOrigin() const { return m_haveInitializedSecurityOrigin; }
 
 private:
     bool m_haveInitializedSecurityOrigin;
     RefPtr<SecurityOrigin> m_securityOrigin;
-    OwnPtr<ContentSecurityPolicy> m_contentSecurityPolicy;
+    RefPtr<ContentSecurityPolicy> m_contentSecurityPolicy;
 };
 
 } // namespace WebCore
 
 #endif // SecurityContext_h