Use lossy prefs in the net predictor, and update them more frequently

chrome/browser/net/predictor.h

Index: chrome/browser/net/predictor.h
diff --git a/chrome/browser/net/predictor.h b/chrome/browser/net/predictor.h
index 527a366eba090f0a43ab5d8c8d5f701205389f08..9d0bf2a1e161c484be8e8f89be718017e9903920 100644
--- a/chrome/browser/net/predictor.h
+++ b/chrome/browser/net/predictor.h
@@ -172,10 +172,16 @@ class Predictor {
 
   virtual void ShutdownOnUIThread();
 
+  void UpdatePrefsOnUIThread(base::ListValue* startup_list,
+                             base::ListValue* referral_list);
+
   // ------------- End UI thread methods.
 
   // ------------- Start IO thread methods.
 
+  void WriteDnsPrefetchState(base::ListValue* startup_list,
+                             base::ListValue* referral_list);
+
   // Cancel pending requests and prevent new ones from being made.
   void Shutdown();
 
@@ -238,14 +244,9 @@ class Predictor {
   void DnsPrefetchMotivatedList(const std::vector<GURL>& urls,
                                 UrlInfo::ResolutionMotivation motivation);
 
-  // May be called from either the IO or UI thread and will PostTask
-  // to the IO thread if necessary.
+  // Called from the UI thread in response to the load event.
   void SaveStateForNextStartup();
 
-  void SaveDnsPrefetchStateForNextStartup(base::ListValue* startup_list,
-                                          base::ListValue* referral_list,
-                                          base::WaitableEvent* completion);
-
   // May be called from either the IO or UI thread and will PostTask
   // to the IO thread if necessary.
   void PreconnectUrl(const GURL& url,