Update plugin revisions

Update revisions of delete-project, gitiles and webhooks to
include merges from stable-3.0.

Change-Id: I7d566c72856937a3018b0ffd7219642e673279cd
diff --git a/plugins/delete-project b/plugins/delete-project
index 4223c71..d520c74 160000
--- a/plugins/delete-project
+++ b/plugins/delete-project
@@ -1 +1 @@
-Subproject commit 4223c71d319b04c6b42566d2d12adca20734526d
+Subproject commit d520c74076714ed6f607693b6a737615dfd829b2
diff --git a/plugins/gitiles b/plugins/gitiles
index bdbed9a..9f7b84e 160000
--- a/plugins/gitiles
+++ b/plugins/gitiles
@@ -1 +1 @@
-Subproject commit bdbed9af9bb2b77cd7fc8681da2dcee7e8f30264
+Subproject commit 9f7b84e3ad1192b10a549d7e2ea2b920f84492de
diff --git a/plugins/webhooks b/plugins/webhooks
index e267456..b8fe69d 160000
--- a/plugins/webhooks
+++ b/plugins/webhooks
@@ -1 +1 @@
-Subproject commit e26745604c1f4301cf5d130d4bcc9da8463e0b1a
+Subproject commit b8fe69d328f77af32da6b05af28c8ed10beb8bd9