CSP: Replace 'static_cast' with 'toDocument'.

Source/core/frame/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
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY GOOGLE INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef ContentSecurityPolicy_h
 #define ContentSecurityPolicy_h
 
 #include "bindings/v8/ScriptState.h"
+#include "core/dom/Document.h"
 #include "platform/network/HTTPParsers.h"
 #include "platform/weborigin/ReferrerPolicy.h"
 #include "wtf/HashSet.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/Vector.h"
 #include "wtf/text/StringHash.h"
 #include "wtf/text/TextPosition.h"
 #include "wtf/text/WTFString.h"
 
 namespace WTF {
@@ skipping 115 matching lines @@
     KURL completeURL(const String&) const;
     SecurityOrigin* securityOrigin() const;
     void enforceSandboxFlags(SandboxFlags) const;
     String evalDisabledErrorMessage() const;
     String styleEvalDisabledErrorMessage() const;
 
     bool experimentalFeaturesEnabled() const;
 
     static bool shouldBypassMainWorld(ExecutionContext*);
 
-    ExecutionContextClient* client() { return m_client; }
+    ExecutionContextClient* client() const { return m_client; }
+    Document* document() const { return client()->isDocument() ? toDocument(client()) : 0; }
 
 private:
     explicit ContentSecurityPolicy(ExecutionContextClient*);
 
     void logToConsole(const String& message) const;
     void addPolicyFromHeaderValue(const String&, HeaderType, HeaderSource);
 
     bool shouldSendViolationReport(const String&) const;
     void didSendViolationReport(const String&);
 
     ExecutionContextClient* m_client;
     bool m_overrideInlineStyleAllowed;
     CSPDirectiveListVector m_policies;
 
     HashSet<unsigned, AlreadyHashed> m_violationReportsSent;
 
     // We put the hash functions used on the policy object so that we only need
     // to calculate a hash once and then distribute it to all of the directives
     // for validation.
     uint8_t m_scriptHashAlgorithmsUsed;
     uint8_t m_styleHashAlgorithmsUsed;
 };
 
 }
 
 #endif