Switch to standard integer types in sync/.

sync/syncable/write_transaction_info.cc

Index: sync/syncable/write_transaction_info.cc
diff --git a/sync/syncable/write_transaction_info.cc b/sync/syncable/write_transaction_info.cc
index a8a23271db583bc9772f3f9b923d12eeda51a9c8..6a2df9fab5336c8e00d9d73c6c97296cf5ff985b 100644
--- a/sync/syncable/write_transaction_info.cc
+++ b/sync/syncable/write_transaction_info.cc
@@ -4,13 +4,16 @@
 
 #include "sync/syncable/write_transaction_info.h"
 
+#include <stddef.h>
+#include <stdint.h>
+
 #include "base/strings/string_number_conversions.h"
 
 namespace syncer {
 namespace syncable {
 
 WriteTransactionInfo::WriteTransactionInfo(
-    int64 id,
+    int64_t id,
     tracked_objects::Location location,
     WriterTag writer,
     ImmutableEntryKernelMutationMap mutations)