Warn developers about deprecated features only once per page-load.

Source/core/page/ContentSecurityPolicy.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 107 matching lines @@
     void reportInvalidDirectiveValueCharacter(const String& directiveName, const String& value) const;
     void reportInvalidPathCharacter(const String& directiveName, const String& value, const char) const;
     void reportInvalidNonce(const String&) const;
     void reportInvalidPluginTypes(const String&) const;
     void reportInvalidSandboxFlags(const String&) const;
     void reportInvalidSourceExpression(const String& directiveName, const String& source) const;
     void reportInvalidReflectedXSS(const String&) const;
     void reportMissingReportURI(const String&) const;
     void reportUnsupportedDirective(const String&) const;
     void reportViolation(const String& directiveText, const String& effectiveDirective, const String& consoleMessage, const KURL& blockedURL, const Vector<KURL>& reportURIs, const String& header, const String& contextURL = String(), const WTF::OrdinalNumber& contextLine = WTF::OrdinalNumber::beforeFirst(), ScriptState* = 0) const;
-    void reportDeprecatedHeader(HeaderType) const;
 
     void reportBlockedScriptExecutionToInspector(const String& directiveText) const;
 
     const KURL& url() const;
     KURL completeURL(const String&) const;
     SecurityOrigin* securityOrigin() const;
     void enforceSandboxFlags(SandboxFlags) const;
     String evalDisabledErrorMessage() const;
 
     bool experimentalFeaturesEnabled() const;
 
 private:
     explicit ContentSecurityPolicy(ScriptExecutionContext*);
 
     void logToConsole(const String& message, const String& contextURL = String(), const WTF::OrdinalNumber& contextLine = WTF::OrdinalNumber::beforeFirst(), ScriptState* = 0) const;
 
     ScriptExecutionContext* m_scriptExecutionContext;
     bool m_overrideInlineStyleAllowed;
     CSPDirectiveListVector m_policies;
 };
 
 }
 
 #endif