[Android] Simplify "network predictions" preference to a boolean value.

chrome/browser/net/prediction_options.h

 // 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.
 
 #ifndef CHROME_BROWSER_NET_PREDICTION_OPTIONS_H_
 #define CHROME_BROWSER_NET_PREDICTION_OPTIONS_H_
 
 namespace user_prefs {
 class PrefRegistrySyncable;
 }
 
 class PrefService;
 class ProfileIOData;
 
 namespace chrome_browser_net {
 
 // Enum describing when to allow network predictions based on connection type.
 // The numerical value is stored in the prefs file, therefore the same enum
 // with the same order must be used by the platform-dependent components.
 enum NetworkPredictionOptions {
+  // TODO(newt): collapse ALWAYS and WIFI_ONLY into a single value.

[pasko, 2016/02/25 21:43:20]

nit: maybe mention crbug here as well?

[newt (away), 2016/02/25 21:51:24]

Done.

   NETWORK_PREDICTION_ALWAYS,
   NETWORK_PREDICTION_WIFI_ONLY,
   NETWORK_PREDICTION_NEVER,
   NETWORK_PREDICTION_DEFAULT = NETWORK_PREDICTION_WIFI_ONLY,
 };
 
 enum class NetworkPredictionStatus {
   ENABLED,
   DISABLED_ALWAYS,
   DISABLED_DUE_TO_NETWORK,
@@ skipping 17 matching lines @@
 
 // To be executed on the IO thread only.
 bool CanPreresolveAndPreconnectIO(ProfileIOData* profile_io_data);
 
 // To be executed on the UI thread only.
 bool CanPreresolveAndPreconnectUI(PrefService* prefs);
 
 }  // namespace chrome_browser_net
 
 #endif  // CHROME_BROWSER_NET_PREDICTION_OPTIONS_H_