Revert of Remove migrateNetworkPredictionPreferences().

chrome/browser/android/preferences/pref_service_bridge.cc

Index: chrome/browser/android/preferences/pref_service_bridge.cc
diff --git a/chrome/browser/android/preferences/pref_service_bridge.cc b/chrome/browser/android/preferences/pref_service_bridge.cc
index 9b0cc72c2f4a9e4c0642b86b92421e2dcbfd01a9..531fe4666d77cac89cfa39318b866ad366b744f0 100644
--- a/chrome/browser/android/preferences/pref_service_bridge.cc
+++ b/chrome/browser/android/preferences/pref_service_bridge.cc
@@ -723,6 +723,28 @@
   GetPrefService()->SetInteger(prefs::kNetworkPredictionOptions, option);
 }
 
+static jboolean NetworkPredictionEnabledHasUserSetting(JNIEnv* env,
+                                                       jobject obj) {
+  return GetPrefService()->GetUserPrefValue(
+      prefs::kNetworkPredictionEnabled) != NULL;
+}
+
+static jboolean NetworkPredictionOptionsHasUserSetting(JNIEnv* env,
+                                                       jobject obj) {
+  return GetPrefService()->GetUserPrefValue(
+      prefs::kNetworkPredictionOptions) != NULL;
+}
+
+static jboolean GetNetworkPredictionEnabledUserPrefValue(JNIEnv* env,
+                                                         jobject obj) {
+  const base::Value* network_prediction_enabled =
+      GetPrefService()->GetUserPrefValue(prefs::kNetworkPredictionEnabled);
+  DCHECK(network_prediction_enabled);
+  bool value = false;
+  DCHECK(network_prediction_enabled->GetAsBoolean(&value));
+  return value;
+}
+
 static void SetResolveNavigationErrorEnabled(JNIEnv* env, jobject obj,
                                              jboolean enabled) {
   GetPrefService()->SetBoolean(prefs::kAlternateErrorPagesEnabled, enabled);