Remove static initializer in url_info.cc.

chrome/browser/net/url_info.h

Index: chrome/browser/net/url_info.h
diff --git a/chrome/browser/net/url_info.h b/chrome/browser/net/url_info.h
index ddabcae8b507fc0a26dcaed1f2cf74f2ec846e0d..ca5ee1f7af6a3f8d13a4c2d436d2523ab172aa44 100644
--- a/chrome/browser/net/url_info.h
+++ b/chrome/browser/net/url_info.h
@@ -64,14 +64,12 @@ class UrlInfo {
       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).
@@ -151,9 +149,6 @@ class UrlInfo {
   // 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_;