Bump to watcher 0.9.7+8.

Change-Id: If1705ac18715876fc5c1325dab4c3dda42b8d2b9
Reviewed-on: https://dart-review.googlesource.com/56580
Reviewed-by: Kevin Moore <kevmoo@google.com>
Commit-Queue: Konstantin Shcheglov <scheglov@google.com>
diff --git a/DEPS b/DEPS
index 7c56ab6..e22fc1e 100644
--- a/DEPS
+++ b/DEPS
@@ -136,7 +136,7 @@
   "typed_data_tag": "1.1.3",
   "usage_tag": "3.3.0",
   "utf_tag": "0.9.0+4",
-  "watcher_tag": "0.9.7+7",
+  "watcher_tag": "0.9.7+8",
   "web_components_rev": "8f57dac273412a7172c8ade6f361b407e2e4ed02",
   "web_socket_channel_tag": "1.0.7",
   "WebCore_rev": "fb11e887f77919450e497344da570d780e078bc8",