Expose Document::isPrivilegedContext from WebDocument

Source/core/testing/NullExecutionContext.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 NullExecutionContext_h
 #define NullExecutionContext_h
 
 #include "core/dom/ExecutionContext.h"
 #include "core/dom/SecurityContext.h"
 #include "core/events/EventQueue.h"
@@ skipping 16 matching lines @@
     virtual void postTask(const WebTraceLocation&, PassOwnPtr<ExecutionContextTask>) override;
 
     virtual EventTarget* errorEventTarget() override { return nullptr; }
     virtual EventQueue* eventQueue() const override { return m_queue.get(); }
 
     virtual bool tasksNeedSuspension() override { return m_tasksNeedSuspension; }
     void setTasksNeedSuspension(bool flag) { m_tasksNeedSuspension = flag; }
 
     virtual void reportBlockedScriptExecutionToInspector(const String& directiveText) override { }
     virtual void didUpdateSecurityOrigin() override { }
-    virtual SecurityContext& securityContext() override { return *this; }
+    virtual const SecurityContext& securityContext() const override { return *this; }
     virtual DOMTimerCoordinator* timers() override { return nullptr; }
 
     double timerAlignmentInterval() const;
 
     virtual void addConsoleMessage(PassRefPtrWillBeRawPtr<ConsoleMessage>) override { }
     virtual void logExceptionToConsole(const String& errorMessage, int scriptId, const String& sourceURL, int lineNumber, int columnNumber, PassRefPtrWillBeRawPtr<ScriptCallStack>) override { }
 
-    bool isPrivilegedContext(String& errorMessage, const PrivilegeContextCheck = StandardPrivilegeCheck);
+    bool isPrivilegedContext(String& errorMessage, const PrivilegeContextCheck = StandardPrivilegeCheck) const override;
 
     DEFINE_INLINE_TRACE()
     {
         visitor->trace(m_queue);
         ExecutionContext::trace(visitor);
     }
 
 #if !ENABLE(OILPAN)
     using RefCounted<NullExecutionContext>::ref;
     using RefCounted<NullExecutionContext>::deref;
 
     virtual void refExecutionContext() override { ref(); }
     virtual void derefExecutionContext() override { deref(); }
 #endif
 
 protected:
     virtual const KURL& virtualURL() const override { return m_dummyURL; }
     virtual KURL virtualCompleteURL(const String&) const override { return m_dummyURL; }
 
 private:
     bool m_tasksNeedSuspension;
     OwnPtrWillBeMember<EventQueue> m_queue;
 
     KURL m_dummyURL;
 };
 
 } // namespace blink
 
 #endif // NullExecutionContext_h