Remove cq_name from cq.cfg.

LUCI rejected a recent cq.cfg update because the pre-existing config had
this error:

"cq.cfg: cq_name is no longer used and can and should be removed."

TBR=nodir@chromium.org

Change-Id: I4b4e2bb9ed39896fa091d3fec929443417c0e8f3
Reviewed-on: https://pdfium-review.googlesource.com/42371
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>

infra/config/cq.cfg

diff --git a/infra/config/cq.cfg b/infra/config/cq.cfg
index 2045cd4..8343cb6 100644
--- a/infra/config/cq.cfg
+++ b/infra/config/cq.cfg
@@ -2,7 +2,6 @@
 # documentation of this file format.
 
 version: 1
-cq_name: "pdfium"
 git_repo_url: "https://pdfium.googlesource.com/pdfium.git"
 cq_status_url: "https://chromium-cq-status.appspot.com"