Migrate startup URLs pref.

chrome/browser/prefs/pref_model_associator.h

 // Copyright (c) 2012 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_PREFS_PREF_MODEL_ASSOCIATOR_H_
 #define CHROME_BROWSER_PREFS_PREF_MODEL_ASSOCIATOR_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 100 matching lines @@
  protected:
   friend class ProfileSyncServicePreferenceTest;
 
   typedef std::map<std::string, syncer::SyncData> SyncDataMap;
 
   // Create an association for a given preference. If |sync_pref| is valid,
   // signifying that sync has data for this preference, we reconcile their data
   // with ours and append a new UPDATE SyncChange to |sync_changes|. If
   // sync_pref is not set, we append an ADD SyncChange to |sync_changes| with
   // the current preference data.
+  // |migrated_preference_list| points to a vector that may be updated with a
+  // string containing the old name of the preference described by |pref_name|.
   // Note: We do not modify the sync data for preferences that are either
   // controlled by policy (are not user modifiable) or have their default value
   // (are not user controlled).
   void InitPrefAndAssociate(const syncer::SyncData& sync_pref,
                             const std::string& pref_name,
-                            syncer::SyncChangeList* sync_changes);
+                            syncer::SyncChangeList* sync_changes,
+                            SyncDataMap* migrated_preference_list);
 
   static base::Value* MergeListValues(
       const base::Value& from_value, const base::Value& to_value);
   static base::Value* MergeDictionaryValues(const base::Value& from_value,
                                             const base::Value& to_value);
 
   // Do we have an active association between the preferences and sync models?
   // Set when start syncing, reset in StopSyncing. While this is not set, we
   // ignore any local preference changes (when we start syncing we will look
   // up the most recent values anyways).
@@ skipping 40 matching lines @@
       SyncedPrefObserverMap;
 
   void NotifySyncedPrefObservers(const std::string& path, bool from_sync) const;
 
   SyncedPrefObserverMap synced_pref_observers_;
 
   DISALLOW_COPY_AND_ASSIGN(PrefModelAssociator);
 };
 
 #endif  // CHROME_BROWSER_PREFS_PREF_MODEL_ASSOCIATOR_H_