Revert 211950 "Display DNS probe results."

chrome/browser/net/dns_probe_runner.h

-// Copyright 2013 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 CHROME_BROWSER_NET_DNS_PROBE_RUNNER_H_
-#define CHROME_BROWSER_NET_DNS_PROBE_RUNNER_H_
-
-#include "base/basictypes.h"
-#include "base/bind.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/memory/weak_ptr.h"
-
-namespace net {
-class DnsClient;
-class DnsResponse;
-class DnsTransaction;
-}
-
-namespace chrome_browser_net {
-
-// Runs DNS probes using a single DnsClient and evaluates the responses.
-// (Currently requests A records for google.com and expects at least one IP
-// address in the response.)
-// Used by DnsProbeService to probe the system and public DNS configurations.
-class DnsProbeRunner {
- public:
-  static const char* kKnownGoodHostname;
-
-  // Used in histograms; add new entries at the bottom, and don't remove any.
-  enum Result {
-    UNKNOWN,
-    CORRECT,     // Response contains at least one A record.
-    INCORRECT,   // Response claimed success but included no A records.
-    FAILING,     // Response included an error or was malformed.
-    UNREACHABLE  // No response received (timeout, network unreachable, etc.).
-  };
-
-  DnsProbeRunner();
-  ~DnsProbeRunner();
-
-  // Sets the DnsClient that will be used for DNS probes sent by this runner.
-  // Must be called before RunProbe; can be called repeatedly, including during
-  // a probe.  It will not affect an in-flight probe, if one is running.
-  void SetClient(scoped_ptr<net::DnsClient> client);
-
-  // Starts a probe using the client specified with SetClient, which must have
-  // been called before RunProbe.  |callback| will be called asynchronously
-  // when the result is ready, even if it is ready synchronously.  Must not
-  // be called again until the callback is called, but may be called during the
-  // callback.
-  void RunProbe(const base::Closure& callback);
-
-  // Returns true if a probe is running.  Guaranteed to return true after
-  // RunProbe returns, and false during and after the callback.
-  bool IsRunning() const;
-
-  // Returns the result of the last probe.
-  Result result() const { return result_; }
-
- private:
-  void OnTransactionComplete(net::DnsTransaction* transaction,
-                             int net_error,
-                             const net::DnsResponse* response);
-  void CallCallback();
-
-  base::WeakPtrFactory<DnsProbeRunner> weak_factory_;
-
-  scoped_ptr<net::DnsClient> client_;
-
-  // The callback passed to |RunProbe|.  Cleared right before calling the
-  // callback.
-  base::Closure callback_;
-
-  // The transaction started in |RunProbe| for the DNS probe.  Reset once the
-  // results have been examined.
-  scoped_ptr<net::DnsTransaction> transaction_;
-
-  Result result_;
-
-  DISALLOW_COPY_AND_ASSIGN(DnsProbeRunner);
-};
-
-}  // namespace chrome_browser_net
-
-#endif  // CHROME_BROWSER_NET_DNS_PROBE_RUNNER_H_