Convert //sync from scoped_ptr to std::unique_ptr

sync/internal_api/public/base/progress_marker_map.cc

Index: sync/internal_api/public/base/progress_marker_map.cc
diff --git a/sync/internal_api/public/base/progress_marker_map.cc b/sync/internal_api/public/base/progress_marker_map.cc
index c4e4c49778502e21666977d9fe5f1d745dd53afc..61a583716f42f9ccce4904a5f15e717a4a16d0bc 100644
--- a/sync/internal_api/public/base/progress_marker_map.cc
+++ b/sync/internal_api/public/base/progress_marker_map.cc
@@ -11,9 +11,9 @@
 
 namespace syncer {
 
-scoped_ptr<base::DictionaryValue> ProgressMarkerMapToValue(
+std::unique_ptr<base::DictionaryValue> ProgressMarkerMapToValue(
     const ProgressMarkerMap& marker_map) {
-  scoped_ptr<base::DictionaryValue> value(new base::DictionaryValue());
+  std::unique_ptr<base::DictionaryValue> value(new base::DictionaryValue());
   for (ProgressMarkerMap::const_iterator it = marker_map.begin();
        it != marker_map.end(); ++it) {
     std::string printable_payload;