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

content/browser/frame_host/ancestor_throttle.h

Index: content/browser/frame_host/ancestor_throttle.h
diff --git a/content/browser/frame_host/ancestor_throttle.h b/content/browser/frame_host/ancestor_throttle.h
deleted file mode 100644
index 2d13328c4608f85bfd5b1c47e4b266aa122868ea..0000000000000000000000000000000000000000
--- a/content/browser/frame_host/ancestor_throttle.h
+++ /dev/null
@@ -1,67 +0,0 @@
-// Copyright 2016 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 CONTENT_BROWSER_FRAME_HOST_ANCESTOR_THROTTLE_H_
-#define CONTENT_BROWSER_FRAME_HOST_ANCESTOR_THROTTLE_H_
-
-#include <memory>
-#include <string>
-
-#include "base/gtest_prod_util.h"
-#include "base/macros.h"
-#include "content/public/browser/navigation_throttle.h"
-
-namespace content {
-class NavigationHandle;
-}
-
-namespace net {
-class HttpResponseHeaders;
-}
-
-namespace content {
-
-// An AncestorThrottle is responsible for enforcing a resource's embedding
-// rules, and blocking requests which violate them.
-class CONTENT_EXPORT AncestorThrottle : public NavigationThrottle {
- public:
-  enum class HeaderDisposition {
-    NONE = 0,
-    DENY,
-    SAMEORIGIN,
-    ALLOWALL,
-    INVALID,
-    CONFLICT,
-    BYPASS
-  };
-
-  static std::unique_ptr<NavigationThrottle> MaybeCreateThrottleFor(
-      NavigationHandle* handle);
-
-  explicit AncestorThrottle(NavigationHandle* handle);
-  ~AncestorThrottle() override;
-
-  NavigationThrottle::ThrottleCheckResult WillProcessResponse() override;
-
- private:
-  FRIEND_TEST_ALL_PREFIXES(AncestorThrottleTest, ParsingXFrameOptions);
-  FRIEND_TEST_ALL_PREFIXES(AncestorThrottleTest, ErrorsParsingXFrameOptions);
-  FRIEND_TEST_ALL_PREFIXES(AncestorThrottleTest,
-                           IgnoreWhenFrameAncestorsPresent);
-
-  void ParseError(const std::string& value, HeaderDisposition disposition);
-  void ConsoleError(HeaderDisposition disposition);
-
-  // Parses an 'X-Frame-Options' header. If the result is either CONFLICT
-  // or INVALID, |header_value| will be populated with the value which caused
-  // the parse error.
-  HeaderDisposition ParseHeader(const net::HttpResponseHeaders* headers,
-                                std::string* header_value);
-
-  DISALLOW_COPY_AND_ASSIGN(AncestorThrottle);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_FRAME_HOST_ANCESTOR_THROTTLE_H_