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diff --git a/net/base/scoped_host_mapper.h b/net/base/scoped_host_mapper.h
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--- a/net/base/scoped_host_mapper.h
+++ /dev/null
@@ -1,91 +0,0 @@
-// Copyright (c) 2006-2008 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.
-
-// This file defines ScopedHostMapper, which is a helper class for writing
-// tests that use HostResolver either directly or indirectly.
-//
-// In most cases, it is important that unit tests avoid making actual DNS
-// queries since the resulting tests can be flaky, especially if the network is
-// unreliable for some reason.  To simplify writing tests that avoid making
-// actual DNS queries, the following helper class may be used:
-//
-//   ScopedHostMapper scoped_host_mapper;
-//   scoped_host_mapper.AddRule("foo.com", "1.2.3.4");
-//   scoped_host_mapper.AddRule("bar.com", "2.3.4.5");
-//   ...
-//
-// The above rules define a static mapping from hostnames to IP address
-// literals.  The first parameter to AddRule specifies a host pattern to match
-// against, and the second parameter indicates what value should be used to
-// replace the given hostname.  So, the following is also supported:
-//
-//   scoped_host_mapper.AddRule("*.com", "127.0.0.1");
-//
-// If there are multiple ScopedHostMappers in existence, then the last one
-// allocated will be used.  However, if it does not provide a matching rule,
-// then it will delegate to the previously set HostMapper (see SetHostMapper).
-// Finally, if no HostMapper matches a given hostname, then the hostname will
-// be unmodified.
-//
-// IMPORTANT: ScopedHostMapper is only designed to be used on a single thread,
-// and it is a requirement that the lifetimes of multiple instances be nested.
-
-#ifndef NET_BASE_SCOPED_HOST_MAPPER_H_
-#define NET_BASE_SCOPED_HOST_MAPPER_H_
-
-#ifdef UNIT_TEST
-
-#include <list>
-
-#include "base/string_util.h"
-#include "net/base/host_resolver.h"
-#include "net/base/net_errors.h"
-
-namespace net {
-
-// This class sets the HostMapper for a particular scope.
-class ScopedHostMapper : public HostMapper {
- public:
-  ScopedHostMapper() {
-    previous_host_mapper_ = SetHostMapper(this);
-  }
-
-  ~ScopedHostMapper() {
-    HostMapper* old_mapper = SetHostMapper(previous_host_mapper_);
-    // The lifetimes of multiple instances must be nested.
-    CHECK(old_mapper == this);
-  }
-
-  // Any hostname matching the given pattern will be replaced with the given
-  // replacement value.  Usually, replacement should be an IP address literal.
-  void AddRule(const char* host_pattern, const char* replacement) {
-    rules_.push_back(Rule(host_pattern, replacement));
-  }
-
- private:
-  std::string Map(const std::string& host) {
-    RuleList::const_iterator r;
-    for (r = rules_.begin(); r != rules_.end(); ++r) {
-      if (MatchPattern(host, r->host_pattern))
-        return r->replacement;
-    }
-    return previous_host_mapper_ ? previous_host_mapper_->Map(host) : host;
-  }
-
-  struct Rule {
-    std::string host_pattern;
-    std::string replacement;
-    Rule(const char* h, const char* r) : host_pattern(h), replacement(r) {}
-  };
-  typedef std::list<Rule> RuleList;
-
-  HostMapper* previous_host_mapper_;
-  RuleList rules_;
-};
-
-}  // namespace net
-
-#endif  // UNIT_TEST
-
-#endif  // NET_BASE_SCOPED_HOST_MAPPER_H_