Backed out changeset c2c4b8d6b915 (bug 1656277) for causing build bustages in nsDocShell.cpp CLOSED TREE

browser/components/migration/MigrationUtils.jsm

@@ -1306,11 +1306,4 @@ var MigrationUtils = Object.freeze({
   getSourceIdForTelemetry(sourceName) {
     return this._sourceNameToIdMapping[sourceName] || 0;
   },
-
-  /* Enum of locations where bookmarks were found in the
-     source browser that we import from */
-  SOURCE_BOOKMARK_ROOTS_BOOKMARKS_TOOLBAR: 1,
-  SOURCE_BOOKMARK_ROOTS_BOOKMARKS_MENU: 2,
-  SOURCE_BOOKMARK_ROOTS_READING_LIST: 4,
-  SOURCE_BOOKMARK_ROOTS_UNFILED: 8,
 });