Remove NETWORK_PREDICTION_UNSET.

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"
 #include "components/pref_registry/pref_registry_syncable.h"
 #include "content/public/browser/browser_thread.h"
 #include "net/base/network_change_notifier.h"
 
 namespace {
 
 // Since looking up preferences and current network connection are presumably
 // both cheap, we do not cache them here.
-bool CanPrefetchAndPrerender(int network_prediction_options,
-                             bool network_prediction_enabled) {
+bool CanPrefetchAndPrerender(int network_prediction_options) {

[gavinp, 2014/08/28 13:34:11]

Hmm, should the type be chrome_browser_net::NetworkPredictionOptions rather than
an int? The disadvantage is that there's a need for a static cast on the result
of GetValue() below, which I guess is a bit weird.

mmenke, wdyt?

   switch (network_prediction_options) {
     case chrome_browser_net::NETWORK_PREDICTION_ALWAYS:
       return true;
-    case chrome_browser_net::NETWORK_PREDICTION_WIFI_ONLY:
-      return !net::NetworkChangeNotifier::IsConnectionCellular(
-          net::NetworkChangeNotifier::GetConnectionType());
     case chrome_browser_net::NETWORK_PREDICTION_NEVER:
       return false;
-    case chrome_browser_net::NETWORK_PREDICTION_UNSET:
-      return network_prediction_enabled;
     default:
-      NOTREACHED() << "Unknown kNetworkPredictionOptions value.";
-      return false;
+      return !net::NetworkChangeNotifier::IsConnectionCellular(
+                 net::NetworkChangeNotifier::GetConnectionType());
   }
 }
 
-bool CanPreresolveAndPreconnect(int network_prediction_options,
-                                bool network_prediction_enabled) {
-  switch (network_prediction_options) {
-    case chrome_browser_net::NETWORK_PREDICTION_ALWAYS:
-      return true;
-    // DNS preresolution and TCP preconnect are performed even on cellular
-    // networks if the user setting is WIFI_ONLY.
-    case chrome_browser_net::NETWORK_PREDICTION_WIFI_ONLY:
-      return true;
-    case chrome_browser_net::NETWORK_PREDICTION_NEVER:
-      return false;
-    case chrome_browser_net::NETWORK_PREDICTION_UNSET:
-      return network_prediction_enabled;
-    default:
-      NOTREACHED() << "Unknown kNetworkPredictionOptions value.";
-      return false;
-  }
+bool CanPreresolveAndPreconnect(int network_prediction_options) {
+  // DNS preresolution and TCP preconnect are performed even on cellular
+  // networks if the user setting is WIFI_ONLY.
+  return network_prediction_options !=
+         chrome_browser_net::NETWORK_PREDICTION_NEVER;
 }
 
 }  // namespace
 
 namespace chrome_browser_net {
 
 void RegisterPredictionOptionsProfilePrefs(
     user_prefs::PrefRegistrySyncable* registry) {
   registry->RegisterIntegerPref(
       prefs::kNetworkPredictionOptions,
-      chrome_browser_net::NETWORK_PREDICTION_UNSET,
+      chrome_browser_net::NETWORK_PREDICTION_DEFAULT,
       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 CanPrefetchAndPrerenderIO(ProfileIOData* profile_io_data) {
   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::IO));
   DCHECK(profile_io_data);
   return CanPrefetchAndPrerender(
-      profile_io_data->network_prediction_options()->GetValue(),
-      profile_io_data->network_prediction_enabled()->GetValue());
+      profile_io_data->network_prediction_options()->GetValue());
 }
 
 bool CanPrefetchAndPrerenderUI(PrefService* prefs) {
   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
   DCHECK(prefs);
   return CanPrefetchAndPrerender(
-      prefs->GetInteger(prefs::kNetworkPredictionOptions),
-      prefs->GetBoolean(prefs::kNetworkPredictionEnabled));
+      prefs->GetInteger(prefs::kNetworkPredictionOptions));
 }
 
 bool CanPredictNetworkActionsUI(PrefService* prefs) {
   return CanPrefetchAndPrerenderUI(prefs);
 }
 
 bool CanPreresolveAndPreconnectIO(ProfileIOData* profile_io_data) {
   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::IO));
   DCHECK(profile_io_data);
   return CanPreresolveAndPreconnect(
-      profile_io_data->network_prediction_options()->GetValue(),
-      profile_io_data->network_prediction_enabled()->GetValue());
+      profile_io_data->network_prediction_options()->GetValue());
 }
 
 bool CanPreresolveAndPreconnectUI(PrefService* prefs) {
   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
   DCHECK(prefs);
   return CanPreresolveAndPreconnect(
-      prefs->GetInteger(prefs::kNetworkPredictionOptions),
-      prefs->GetBoolean(prefs::kNetworkPredictionEnabled));
+      prefs->GetInteger(prefs::kNetworkPredictionOptions));
 }
 
 }  // namespace chrome_browser_net