Rest of the autofill work.

chrome/browser/sync/syncable/directory_backing_store.h

Index: chrome/browser/sync/syncable/directory_backing_store.h
diff --git a/chrome/browser/sync/syncable/directory_backing_store.h b/chrome/browser/sync/syncable/directory_backing_store.h
index f1a09dd7bff3ddbfce6974b1816ff5ecace7610c..ef767011b45103657359e20cdb2ec11308e88945 100644
--- a/chrome/browser/sync/syncable/directory_backing_store.h
+++ b/chrome/browser/sync/syncable/directory_backing_store.h
@@ -80,6 +80,7 @@ class DirectoryBackingStore {
   FRIEND_TEST_ALL_PREFIXES(DirectoryBackingStoreTest, MigrateVersion70To71);
   FRIEND_TEST_ALL_PREFIXES(DirectoryBackingStoreTest, MigrateVersion71To72);
   FRIEND_TEST_ALL_PREFIXES(DirectoryBackingStoreTest, MigrateVersion72To73);
+  FRIEND_TEST_ALL_PREFIXES(DirectoryBackingStoreTest, MigrateVersion73To74);
   FRIEND_TEST_ALL_PREFIXES(DirectoryBackingStoreTest, ModelTypeIds);
   FRIEND_TEST_ALL_PREFIXES(DirectoryBackingStoreTest, Corruption);
   FRIEND_TEST_ALL_PREFIXES(DirectoryBackingStoreTest, DeleteEntries);
@@ -172,6 +173,7 @@ class DirectoryBackingStore {
   bool MigrateVersion70To71();
   bool MigrateVersion71To72();
   bool MigrateVersion72To73();
+  bool MigrateVersion73To74();
 
   // The handle to our sqlite on-disk store for initialization and loading, and
   // for saving changes periodically via SaveChanges, respectively.