[GCM] Updating GCM Status Syncer to the new Experiment Status pb

BUG=421210

Review URL: https://codereview.chromium.org/635093002

Cr-Commit-Position: refs/heads/master@{#298771}
diff --git a/components/gcm_driver/DEPS b/components/gcm_driver/DEPS
index 93923ff..e7bf510 100644
--- a/components/gcm_driver/DEPS
+++ b/components/gcm_driver/DEPS
@@ -7,4 +7,5 @@
   "+google_apis/gcm",
   "+jni",
   "+net",
+  "+sync/protocol",
 ]