Replace the WAS_INSTALLED_BY_CUSTODIAN creation flag with a pref

chrome/browser/extensions/extension_sync_data.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_EXTENSIONS_EXTENSION_SYNC_DATA_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_SYNC_DATA_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 35 matching lines @@
     GURL url;
     int size;
   };
 
   // Extension constructor.
   ExtensionSyncData(const Extension& extension,
                     bool enabled,
                     int disable_reasons,
                     bool incognito_enabled,
                     bool remote_install,
-                    OptionalBoolean all_urls_enabled);
+                    OptionalBoolean all_urls_enabled,
+                    bool installed_by_custodian);
   // App constructor.
   ExtensionSyncData(const Extension& extension,
                     bool enabled,
                     int disable_reasons,
                     bool incognito_enabled,
                     bool remote_install,
                     OptionalBoolean all_urls_enabled,
+                    bool installed_by_custodian,
                     const syncer::StringOrdinal& app_launch_ordinal,
                     const syncer::StringOrdinal& page_ordinal,
                     extensions::LaunchType launch_type);
   ExtensionSyncData(const ExtensionSyncData& other);
   ~ExtensionSyncData();
 
   // For constructing an ExtensionSyncData from received sync data.
   // May return null if the sync data was invalid.
   static std::unique_ptr<ExtensionSyncData> CreateFromSyncData(
       const syncer::SyncData& sync_data);
@@ skipping 92 matching lines @@
   extensions::LaunchType launch_type_;
   std::string bookmark_app_url_;
   std::string bookmark_app_description_;
   std::string bookmark_app_icon_color_;
   std::vector<LinkedAppIconInfo> linked_icons_;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_SYNC_DATA_H_