Update git submodules

* Update plugins/gitiles from branch 'master'
  to 7cb549065f11f84ece2b9f82da72ef7ac6637a77
  - Close Repository objects in RepositoryResolverAccessTest
    
    Avoid false positives when looking for Repository
    reference counting leaks by always closing the objects
    after creation and assertions have completed.
    
    Release-Notes: skip
    Change-Id: Id30ec5876d165e96c5b95a2edbd5924b160e983d
    

plugins/gitiles

diff --git a/plugins/gitiles b/plugins/gitiles
index 4e8bd70..7cb5490 160000
--- a/plugins/gitiles
+++ b/plugins/gitiles
@@ -1 +1 @@
-Subproject commit 4e8bd706e87eb11e3cfe2bfa9bbcb29020f39482
+Subproject commit 7cb549065f11f84ece2b9f82da72ef7ac6637a77