Update "Predict network actions" UI setting.

chrome/browser/net/prediction_options.cc

 // Copyright 2014 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.
 
 #include "chrome/browser/net/prediction_options.h"
 
 #include "base/logging.h"
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile_io_data.h"
 #include "chrome/common/pref_names.h"
@@ skipping 28 matching lines @@
 namespace chrome_browser_net {
 
 void RegisterPredictionOptionsProfilePrefs(
     user_prefs::PrefRegistrySyncable* registry) {
   registry->RegisterIntegerPref(
       prefs::kNetworkPredictionOptions,
       chrome_browser_net::NETWORK_PREDICTION_UNSET,
       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 }
 
+void MigrateNetworkPredictionUserPrefs(PrefService* pref_service) {
+  // Nothing to do if the user or this migration code has already set the new
+  // preference.
+  if (pref_service->GetUserPrefValue(prefs::kNetworkPredictionOptions))
+    return;
+
+  // Nothing to do if the user has not set the old preference.
+  const base::Value* network_prediction_enabled =
+      pref_service->GetUserPrefValue(prefs::kNetworkPredictionEnabled);
+  if (!network_prediction_enabled)
+    return;
+
+  bool value = false;
+  if (network_prediction_enabled->GetAsBoolean(&value)) {
+    pref_service->SetInteger(
+        prefs::kNetworkPredictionOptions,
+        value ? chrome_browser_net::NETWORK_PREDICTION_WIFI_ONLY
+              : chrome_browser_net::NETWORK_PREDICTION_NEVER);
+  }
+}
+
 bool CanPredictNetworkActionsIO(ProfileIOData* profile_io_data) {
   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::IO));
   DCHECK(profile_io_data);
 
   return CanPredictNetworkActions(
       profile_io_data->network_prediction_options()->GetValue(),
       profile_io_data->network_prediction_enabled()->GetValue());
 }
 
 bool CanPredictNetworkActionsUI(PrefService* prefs) {
   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
   DCHECK(prefs);
   return CanPredictNetworkActions(
       prefs->GetInteger(prefs::kNetworkPredictionOptions),
       prefs->GetBoolean(prefs::kNetworkPredictionEnabled));
 }
 
 }  // namespace chrome_browser_net