Fix remaining incompatibilities between scoped_ptr and unique_ptr.

sync/sessions/data_type_tracker.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "sync/sessions/data_type_tracker.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 
@@ skipping 184 matching lines @@
        it != pending_invalidations_.end();
        ++it) {
     if (!(*it)->IsUnknownVersion()) {
       msg->add_notification_hint((*it)->GetPayload());
     }
   }
 
   msg->set_server_dropped_hints(
       !pending_invalidations_.empty() &&
       (*pending_invalidations_.begin())->IsUnknownVersion());
-  msg->set_client_dropped_hints(last_dropped_invalidation_);
+  msg->set_client_dropped_hints(!!last_dropped_invalidation_);
   msg->set_local_modification_nudges(local_nudge_count_);
   msg->set_datatype_refresh_nudges(local_refresh_request_count_);
   msg->set_initial_sync_in_progress(initial_sync_required_);
   msg->set_sync_for_resolve_conflict_in_progress(
       sync_required_to_resolve_conflict_);
 }
 
 bool DataTypeTracker::IsThrottled() const {
   return !unthrottle_time_.is_null();
 }
@@ skipping 18 matching lines @@
     unthrottle_time_ = base::TimeTicks();
   }
 }
 
 void DataTypeTracker::UpdateLocalNudgeDelay(base::TimeDelta delay) {
   nudge_delay_ = delay;
 }
 
 }  // namespace sessions
 }  // namespace syncer