Update "Predict network actions" UI setting.

chrome/browser/net/prediction_options.h

Index: chrome/browser/net/prediction_options.h
diff --git a/chrome/browser/net/prediction_options.h b/chrome/browser/net/prediction_options.h
index d7114c8778324525305fa31ca0ed8792949e791e..2829409082c96036ea38cfedae9370c681299020 100644
--- a/chrome/browser/net/prediction_options.h
+++ b/chrome/browser/net/prediction_options.h
@@ -30,6 +30,10 @@ enum NetworkPredictionOptions {
 void RegisterPredictionOptionsProfilePrefs(
     user_prefs::PrefRegistrySyncable* registry);
 
+// Migrate prefs::kNetworkPredictionEnabled user setting (if exists) to
+// prefs::kNetworkPredictionOptions (if does not have user setting).
+void MigrateNetworkPredictionUserPrefs(PrefService* pref_service);
+
 // The following two global functions determine whether predictive network
 // actions are enabled, based on preferences and network type.