Remove sign_cla entry from cq.cfg

Bug: chromium:851750
Change-Id: I78acb449aa4ccbe25a38913ca68f701fa2aedcb5
Reviewed-on: https://skia-review.googlesource.com/141462
Reviewed-by: Eric Boren <borenet@google.com>
Commit-Queue: Eric Boren <borenet@google.com>
diff --git a/infra/branch-config/cq.cfg b/infra/branch-config/cq.cfg
index 117974d..a60c519 100644
--- a/infra/branch-config/cq.cfg
+++ b/infra/branch-config/cq.cfg
@@ -70,6 +70,4 @@
       timeout_retry_weight: 2
     }
   }
-
-  sign_cla {}
 }