[Sync] Fix sync scheduler/session logic determining successful commands.

sync/engine/syncer.cc

Index: sync/engine/syncer.cc
diff --git a/sync/engine/syncer.cc b/sync/engine/syncer.cc
index ac6b5eb787e354f94b2d5daab3f6ae9c1b631088..f8639c0f47be6da50db9dd65e9510e393c42ef1e 100644
--- a/sync/engine/syncer.cc
+++ b/sync/engine/syncer.cc
@@ -241,8 +241,10 @@ void Syncer::SyncShare(sessions::SyncSession* session,
              << "current step: " << SyncerStepToString(current_step) << ", "
              << "next step: " << SyncerStepToString(next_step) << ", "
              << "snapshot: " << session->TakeSnapshot().ToString();
-    if (last_step == current_step)
+    if (last_step == current_step) {
+      session->SetFinished();
       break;
+    }
     current_step = next_step;
   }
 }