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

third_party/WebKit/Source/core/loader/HttpEquiv.h

 // Copyright 2015 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 HttpEquiv_h
 #define HttpEquiv_h
 
 #include "wtf/Allocator.h"
 #include "wtf/text/AtomicString.h"
 
 namespace blink {
 
 class Document;
 
 /**
  * Handles a HTTP header equivalent set by a meta tag using <meta http-equiv="..." content="...">. This is called
  * when a meta tag is encountered during document parsing, and also when a script dynamically changes or adds a meta
  * tag. This enables scripts to use meta tags to perform refreshes and set expiry dates in addition to them being
  * specified in a HTML file.
  */
 class HttpEquiv {
     STATIC_ONLY(HttpEquiv);
 public:
     static void process(Document&, const AtomicString& equiv, const AtomicString& content, bool inDocumentHeadElement);
 
 private:
     static void processHttpEquivDefaultStyle(Document&, const AtomicString& content);
     static void processHttpEquivRefresh(Document&, const AtomicString& content);
     static void processHttpEquivSetCookie(Document&, const AtomicString& content);
-    static void processHttpEquivXFrameOptions(Document&, const AtomicString& content);
     static void processHttpEquivContentSecurityPolicy(Document&, const AtomicString& equiv, const AtomicString& content);
     static void processHttpEquivAcceptCH(Document&, const AtomicString& content);
 };
 
 } // namespace blink
 
 #endif