(Re-)introduce AncestorThrottle to handle 'X-Frame-Options'.

third_party/WebKit/Source/platform/network/HTTPParsers.h

 /*
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2011 Apple 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
@@ skipping 40 matching lines @@
   ContentDispositionInline,
   ContentDispositionAttachment,
   ContentDispositionOther
 } ContentDispositionType;
 
 enum ContentTypeOptionsDisposition {
   ContentTypeOptionsNone,
   ContentTypeOptionsNosniff
 };
 
-enum XFrameOptionsDisposition {
-  XFrameOptionsInvalid,
-  XFrameOptionsDeny,
-  XFrameOptionsSameOrigin,
-  XFrameOptionsAllowAll,
-  XFrameOptionsConflict
-};
-
 // Be sure to update the behavior of
 // XSSAuditor::combineXSSProtectionHeaderAndCSP whenever you change this enum's
 // content or ordering.
 enum ReflectedXSSDisposition {
   ReflectedXSSUnset = 0,
   AllowReflectedXSS,
   ReflectedXSSInvalid,
   FilterReflectedXSS,
   BlockReflectedXSS
 };
@@ skipping 49 matching lines @@
 PLATFORM_EXPORT String extractCharsetFromMediaType(const String&);
 PLATFORM_EXPORT void findCharsetInMediaType(const String& mediaType,
                                             unsigned& charsetPos,
                                             unsigned& charsetLen,
                                             unsigned start = 0);
 PLATFORM_EXPORT ReflectedXSSDisposition
 parseXSSProtectionHeader(const String& header,
                          String& failureReason,
                          unsigned& failurePosition,
                          String& reportURL);
-PLATFORM_EXPORT XFrameOptionsDisposition
-parseXFrameOptionsHeader(const String&);
 PLATFORM_EXPORT CacheControlHeader
 parseCacheControlDirectives(const AtomicString& cacheControlHeader,
                             const AtomicString& pragmaHeader);
 PLATFORM_EXPORT void parseCommaDelimitedHeader(const String& headerValue,
                                                CommaDelimitedHeaderSet&);
 // Returns true on success, otherwise false. The Suborigin argument must be a
 // non-null return argument. |messages| is a list of messages based on any
 // parse warnings or errors. Even if parseSuboriginHeader returns true, there
 // may be Strings in |messages|.
 PLATFORM_EXPORT bool parseSuboriginHeader(const String& header,
@@ skipping 14 matching lines @@
 // https://tools.ietf.org/html/draft-ietf-httpbis-jfv-01
 // Returns an empty unique_ptr if the header cannot be parsed as JSON. JSON
 // strings which represent object nested deeper than |maxParseDepth| will also
 // cause an empty return value.
 PLATFORM_EXPORT std::unique_ptr<JSONArray> parseJSONHeader(const String& header,
                                                            int maxParseDepth);
 
 }  // namespace blink
 
 #endif