Remove abonded privacy blacklist implementation.

chrome/browser/privacy_blacklist/blacklist_request_info.cc

-// Copyright (c) 2009 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.
-
-#include "chrome/browser/privacy_blacklist/blacklist_request_info.h"
-
-// static
-const void* const BlacklistRequestInfo::kURLRequestDataKey = 0;
-
-BlacklistRequestInfo::BlacklistRequestInfo(const GURL& url,
-                                           ResourceType::Type resource_type,
-                                           const Blacklist* blacklist)
-    : url_(url),
-      resource_type_(resource_type),
-      blacklist_(blacklist) {
-}
-
-BlacklistRequestInfo::~BlacklistRequestInfo() {
-}
-
-// static
-BlacklistRequestInfo* BlacklistRequestInfo::FromURLRequest(
-    const URLRequest* request) {
-  URLRequest::UserData* user_data =
-      request->GetUserData(&kURLRequestDataKey);
-  return (user_data ? static_cast<BlacklistRequestInfo*>(user_data) : NULL);
-}