Update Gitiles plugin

Change-Id: Iaccb4d3de3a701df383bcdc80afe27fbcf51f47d
diff --git a/plugins/gitiles b/plugins/gitiles
index dcac54b..cf911ed 160000
--- a/plugins/gitiles
+++ b/plugins/gitiles
@@ -1 +1 @@
-Subproject commit dcac54b1afe9275bdd0fc8f3afc2c019b6617ad1
+Subproject commit cf911ed6a3a82b2f17974e005f72d8d99c716e74