cq.cfg: remove cq_name.

It has been deprecated and is no longer required.

R=jbudorick, mknyszek

Bug: 866476
Change-Id: I78b348e6d9a9dcf078608f27853abdd9b6531df1
No-Try: True
Reviewed-on: https://chromium-review.googlesource.com/1155798Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Andrii Shyshkalov <tandrii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579200}

infra/config/branch/cq.cfg

@@ -2,7 +2,6 @@
 # documentation of this file format.
 
 version: 1
-cq_name: "chromium"
 cq_status_url: "https://chromium-cq-status.appspot.com"
 git_repo_url: "https://chromium.googlesource.com/chromium/src"
 commit_burst_delay: 60