Revert "Support replacement of IP address resolutions via command line flag"

net/dns/mapped_ip_resolver.h

-// Copyright 2014 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 NET_DNS_MAPPED_IP_RESOLVER_H_
-#define NET_DNS_MAPPED_IP_RESOLVER_H_
-
-#include <string>
-
-#include "base/memory/scoped_ptr.h"
-#include "base/memory/weak_ptr.h"
-#include "net/base/ip_mapping_rules.h"
-#include "net/base/net_export.h"
-#include "net/dns/host_resolver.h"
-
-namespace net {
-
-// This class wraps an existing HostResolver instance, but modifies the
-// resolution response by inserting or replacing IP addresses before returning
-// it.  Currently, the only directive suported is a "PREFACE" directive which
-// (when a match exists) inserts a single IP address at the start of a list.
-class NET_EXPORT MappedIPResolver : public HostResolver {
- public:
-  // Creates a MappedIPResolver that forwards all of its requests through
-  // |impl|.
-  explicit MappedIPResolver(scoped_ptr<HostResolver> impl);
-  virtual ~MappedIPResolver();
-
-  // Adds a rule to our IP mapper rules_.
-  // The most recently added rule "has priority" and will be used first (in
-  // preference to) any previous rules.  Once one rule is found that matches,
-  // no other rules will be considered.
-  // See ip_mapping_rules.h for syntax and semantics.
-  // Returns true if the rule was successfully parsed and added.
-  bool AddRuleFromString(const std::string& rule_string) {
-    return rules_.AddRuleFromString(rule_string);
-  }
-
-  // Takes a semicolon separated list of rules, and assigns them to this
-  // resolver, discarding any previously added or set rules.
-  void SetRulesFromString(const std::string& rules_string) {
-    rules_.SetRulesFromString(rules_string);
-  }
-
-  // HostResolver methods:
-  virtual int Resolve(const RequestInfo& info,
-                      RequestPriority priority,
-                      AddressList* addresses,
-                      const CompletionCallback& callback,
-                      RequestHandle* out_req,
-                      const BoundNetLog& net_log) OVERRIDE;
-  virtual int ResolveFromCache(const RequestInfo& info,
-                               AddressList* addresses,
-                               const BoundNetLog& net_log) OVERRIDE;
-  virtual void CancelRequest(RequestHandle req) OVERRIDE;
-  virtual void SetDnsClientEnabled(bool enabled) OVERRIDE;
-  virtual HostCache* GetHostCache() OVERRIDE;
-  virtual base::Value* GetDnsConfigAsValue() const OVERRIDE;
-
- private:
-  // Modify the list of resolution |addresses| according to |rules_|, and then
-  // calls the |original_callback| with network error code |rv|.
-  void ApplyRules(const CompletionCallback& original_callback,
-                  AddressList* addresses,
-                  int rv) const;
-
-  scoped_ptr<HostResolver> impl_;
-  IPMappingRules rules_;
-
-  base::WeakPtrFactory<MappedIPResolver> weak_factory_;
-  DISALLOW_COPY_AND_ASSIGN(MappedIPResolver);
-};
-
-}  // namespace net
-
-#endif  // NET_DNS_MAPPED_IP_RESOLVER_H_