Remove static initializer in url_info.cc.

chrome/browser/net/url_info.h

 // Copyright (c) 2011 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.
 
 // A UrlInfo object is used to store prediction related information about a host
 // port and scheme triplet.  When performing DNS pre-resolution of the host/port
 // pair, its state is monitored as it is resolved.
 // It includes progress, from placement in the Predictor's queue, to resolution
 // by the DNS service as either FOUND or NO_SUCH_NAME.  Each instance may also
 // hold records of previous resolution times, which might later be shown to be
@@ skipping 46 matching lines @@
 
   enum DnsProcessingState {
       // When processed by our prefetching system, the states are:
       PENDING,       // Constructor has completed.
       QUEUED,        // In name queue but not yet being resolved.
       ASSIGNED,      // Being resolved (or being reset to earlier state)
       ASSIGNED_BUT_MARKED,  // Needs to be deleted as soon as it's resolved.
       FOUND,         // DNS resolution completed.
       NO_SUCH_NAME,  // DNS resolution completed.
   };
-  static const base::TimeDelta kMaxNonNetworkDnsLookupDuration;
-  // The number of OS cache entries we can guarantee(?) before cache eviction
-  // might likely take place.
-  static const int kMaxGuaranteedDnsCacheSize = 50;
 
   typedef std::vector<UrlInfo> UrlInfoTable;
 
-  static const base::TimeDelta kNullDuration;
+  static base::TimeDelta NullDuration() {
+    return base::TimeDelta::FromMilliseconds(-1);
+  }
 
   // UrlInfo are usually made by the default constructor during
   // initializing of the Predictor's map (of info for Hostnames).
   UrlInfo();
 
   ~UrlInfo();
 
   // NeedDnsUpdate decides, based on our internal info,
   // if it would be valuable to attempt to update (prefectch)
   // DNS data for hostname.  This decision is based
@@ skipping 59 matching lines @@
   // IsStillCached() guesses if the DNS cache still has IP data.
   bool IsStillCached() const;
 
   // Record why we created, or have updated (reqested pre-resolution) of this
   // instance.
   void SetMotivation(ResolutionMotivation motivation);
 
   // Helper function for about:dns printing.
   std::string GetAsciiMotivation() const;
 
-  // The next declaration is non-const to facilitate testing.
-  static base::TimeDelta cache_expiration_duration_;
-
   // The current state of this instance.
   DnsProcessingState state_;
 
   // Record the state prior to going to a queued state, in case we have to back
   // out of the queue.
   DnsProcessingState old_prequeue_state_;
 
   GURL url_;  // Host, port and scheme for this info.
 
   // When was last state changed (usually lookup completed).
@@ skipping 18 matching lines @@
   GURL referring_url_;
 
   // We put these objects into a std::map, and hence we
   // need some "evil" constructors.
   // DISALLOW_COPY_AND_ASSIGN(UrlInfo);
 };
 
 }  // namespace chrome_browser_net
 
 #endif  // CHROME_BROWSER_NET_URL_INFO_H_