Remove sign_cla entry from cq.cfg

Bug: chromium:851750
Change-Id: I44585b804c26e83ab200f161a759f202cdc79a2d
Reviewed-on: https://skia-review.googlesource.com/141463
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 3153160..45f4be8 100644
--- a/infra/branch-config/cq.cfg
+++ b/infra/branch-config/cq.cfg
@@ -29,6 +29,4 @@
       timeout_retry_weight: 2
     }
   }
-
-  sign_cla {}
 }