Introduce AncestorThrottle, which will process 'X-Frame-Options' headers.

third_party/WebKit/Source/core/dom/DocumentInit.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
@@ skipping 80 matching lines @@
         return m_importsController->master()->frame();
     return 0;
 }
 
 SandboxFlags DocumentInit::getSandboxFlags() const
 {
     DCHECK(frameForSecurityContext());
     FrameLoader* loader = &frameForSecurityContext()->loader();
     SandboxFlags flags = loader->effectiveSandboxFlags();
 
-    // If the load was blocked by X-Frame-Options or CSP, force the Document's
-    // origin to be unique, so that the blocked document appears to be a normal
-    // cross-origin document's load per CSP spec:
+    // If the load was blocked by CSP, force the Document's origin to be unique, so that
+    // the blocked document appears to be a normal cross-origin document's load per CSP spec:
     // https://www.w3.org/TR/CSP2/#directive-frame-ancestors
-    if (loader->documentLoader() && loader->documentLoader()->wasBlockedAfterXFrameOptionsOrCSP())
+    if (loader->documentLoader() && loader->documentLoader()->wasBlockedAfterCSP())
         flags |= SandboxOrigin;
 
     return flags;
 }
 
 bool DocumentInit::shouldEnforceStrictMixedContentChecking() const
 {
     DCHECK(frameForSecurityContext());
     return frameForSecurityContext()->loader().shouldEnforceStrictMixedContentChecking();
 }
@@ skipping 63 matching lines @@
 {
     return m_contextDocument;
 }
 
 DocumentInit DocumentInit::fromContext(Document* contextDocument, const KURL& url)
 {
     return DocumentInit(url, 0, contextDocument, 0);
 }
 
 } // namespace blink