Switch to standard integer types in sync/.

sync/engine/directory_update_handler.cc

Index: sync/engine/directory_update_handler.cc
diff --git a/sync/engine/directory_update_handler.cc b/sync/engine/directory_update_handler.cc
index 60b08c53c0909a216a50a3c0cf71bdfe99fd7306..87e5e10715a50ccf098d6fc5fc55dc9f32ed81f8 100644
--- a/sync/engine/directory_update_handler.cc
+++ b/sync/engine/directory_update_handler.cc
@@ -4,6 +4,8 @@
 
 #include "sync/engine/directory_update_handler.h"
 
+#include <stdint.h>
+
 #include <vector>
 
 #include "sync/engine/conflict_resolver.h"
@@ -146,7 +148,7 @@ SyncerError DirectoryUpdateHandler::ApplyUpdatesImpl(
     sessions::StatusController* status) {
   syncable::WriteTransaction trans(FROM_HERE, syncable::SYNCER, dir_);
 
-  std::vector<int64> handles;
+  std::vector<int64_t> handles;
   dir_->GetUnappliedUpdateMetaHandles(
       &trans,
       FullModelTypeSet(type_),