Use delete journal to remove bookmarks that are already deleted in sync model

sync/syncable/directory.h

Index: sync/syncable/directory.h
diff --git a/sync/syncable/directory.h b/sync/syncable/directory.h
index fdb1b8a1e773979823cb7e50c1fde86adb8d59c2..1f42ae50b8c1d5fdaa23db9749a15eb0bf11094b 100644
--- a/sync/syncable/directory.h
+++ b/sync/syncable/directory.h
@@ -23,6 +23,8 @@
 namespace syncer {
 
 class Cryptographer;
+class DeleteJournal;
+class TestUserShare;
 class UnrecoverableErrorHandler;
 
 namespace syncable {
@@ -130,6 +132,8 @@ class SYNC_EXPORT Directory {
   friend class ScopedKernelUnlock;
   friend class WriteTransaction;
   friend class SyncableDirectoryTest;
+  friend class syncer::DeleteJournal;

[tim (not reviewing), 2013/01/14 23:32:48]

Hmm.. let's avoid friend declarations if we can.  It'd be better to expose
delete_journals() publicly, assuming that's what this is for. (or figure out a
way to reverse the dependency / inject it, but I'm not sure that's an option
here.)  

[haitaol1, 2013/01/15 19:44:31]

Done.

+  friend class syncer::TestUserShare;
   FRIEND_TEST_ALL_PREFIXES(SyncableDirectoryTest, ManageDeleteJournals);
   FRIEND_TEST_ALL_PREFIXES(SyncableDirectoryTest,
                            TakeSnapshotGetsAllDirtyHandlesTest);