Remove stl_util from sync.

components/sync/syncable/syncable_delete_journal.h

Index: components/sync/syncable/syncable_delete_journal.h
diff --git a/components/sync/syncable/syncable_delete_journal.h b/components/sync/syncable/syncable_delete_journal.h
index 218f516b31c154e27e8fa9433e0615043615aa89..8fc4635a04136336f12092eee322bc274381063c 100644
--- a/components/sync/syncable/syncable_delete_journal.h
+++ b/components/sync/syncable/syncable_delete_journal.h
@@ -7,21 +7,31 @@
 
 #include <stddef.h>
 
-#include <set>
+#include <map>
 
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/synchronization/lock.h"
+#include "components/sync/syncable/entry_kernel.h"
 #include "components/sync/syncable/metahandle_set.h"
-#include "components/sync/syncable/syncable-inl.h"
 
 namespace syncer {
 namespace syncable {
 
 class BaseTransaction;
-struct EntryKernel;
 
-typedef std::set<const EntryKernel*, LessField<IdField, ID>> JournalIndex;
+class LessByID {
+ public:
+  inline bool operator()(const EntryKernel* a, const EntryKernel* b) const {
+    return a->ref(ID) < b->ref(ID);
+  }
+};
+// This should be |std::set<std::unique_ptr<EntryKernel>, LessByID>|. However,
+// DeleteJournal::TakeSnapshotAndClear needs to remove the unique_ptr from the
+// set, and std::set::extract is only available in C++17. TODO(avi): Switch to
+// using a std::set when Chromium allows C++17 use.
+typedef std::map<const EntryKernel*, std::unique_ptr<EntryKernel>, LessByID>
+    JournalIndex;
 
 // DeleteJournal manages deleted entries that are not in sync directory until
 // it's safe to drop them after the deletion is confirmed with native models.
@@ -30,9 +40,8 @@ typedef std::set<const EntryKernel*, LessField<IdField, ID>> JournalIndex;
 // method requires a non-null |trans| parameter.
 class DeleteJournal {
  public:
-  // Initialize |delete_journals_| using |intitial_journal|, whose content is
-  // destroyed during initialization.
-  explicit DeleteJournal(JournalIndex* initial_journal);
+  // Initialize |delete_journals_| using |initial_journal|.
+  explicit DeleteJournal(std::unique_ptr<JournalIndex> initial_journal);
   ~DeleteJournal();
 
   // For testing only.
@@ -67,7 +76,7 @@ class DeleteJournal {
   // |passive_delete_journal_types_| to |journal_entries|. Move handles in
   // |delete_journals_to_purge_| to |journals_to_purge|. Called on sync thread.
   void TakeSnapshotAndClear(BaseTransaction* trans,
-                            EntryKernelSet* journal_entries,
+                            OwnedEntryKernelSet* journal_entries,
                             MetahandleSet* journals_to_purge);
 
   // Add |entries| to |delete_journals_| regardless of their SERVER_IS_DEL
@@ -76,7 +85,8 @@ class DeleteJournal {
   // * batch add entries of a data type with unrecoverable error to delete
   //   journal before purging them.
   // Called on sync thread.
-  void AddJournalBatch(BaseTransaction* trans, const EntryKernelSet& entries);
+  void AddJournalBatch(BaseTransaction* trans,
+                       const OwnedEntryKernelSet& entries);
 
   // Return true if delete journals of |type| are maintained.
   static bool IsDeleteJournalEnabled(ModelType type);