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

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

 /*
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. http://www.torchmobile.com/
  * 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:
@@ skipping 490 matching lines @@
     }
 }
 
 ContentTypeOptionsDisposition parseContentTypeOptionsHeader(const String& header)
 {
     if (header.stripWhiteSpace().lower() == "nosniff")
         return ContentTypeOptionsNosniff;
     return ContentTypeOptionsNone;
 }
 
+XFrameOptionsDisposition parseXFrameOptionsHeader(const String& header)
+{
+    XFrameOptionsDisposition result = XFrameOptionsInvalid;
+
+    if (header.isEmpty())
+        return result;
+
+    Vector<String> headers;
+    header.split(',', headers);
+
+    bool hasValue = false;
+    for (size_t i = 0; i < headers.size(); i++) {
+        String currentHeader = headers[i].stripWhiteSpace();
+        XFrameOptionsDisposition currentValue = XFrameOptionsInvalid;
+        if (equalIgnoringCase(currentHeader, "deny"))
+            currentValue = XFrameOptionsDeny;
+        else if (equalIgnoringCase(currentHeader, "sameorigin"))
+            currentValue = XFrameOptionsSameOrigin;
+        else if (equalIgnoringCase(currentHeader, "allowall"))
+            currentValue = XFrameOptionsAllowAll;
+
+        if (!hasValue)
+            result = currentValue;
+        else if (result != currentValue)
+            return XFrameOptionsConflict;
+        hasValue = true;
+    }
+    return result;
+}
+
 static bool isCacheHeaderSeparator(UChar c)
 {
     // See RFC 2616, Section 2.2
     switch (c) {
     case '(':
     case ')':
     case '<':
     case '>':
     case '@':
     case ',':
@@ skipping 198 matching lines @@
             return false;
         }
 
         position++;
     }
 
     return true;
 }
 
 } // namespace blink