Remove libfuzzer trybot from default trybot set.

BUG=chromium:577566
TBR=pbos@webrtc.org
NOTRY=True

Review URL: https://codereview.webrtc.org/1585963002

Cr-Commit-Position: refs/heads/master@{#11245}
diff --git a/infra/config/cq.cfg b/infra/config/cq.cfg
index b248cef..4c49280 100644
--- a/infra/config/cq.cfg
+++ b/infra/config/cq.cfg
@@ -45,7 +45,8 @@
       builders { name: "linux_compile_dbg" }
       builders { name: "linux_gn_dbg" }
       builders { name: "linux_gn_rel" }
-      builders { name: "linux_libfuzzer_rel" }
+      # Disabled, see http://crbug.com/577566 for details.
+      #builders { name: "linux_libfuzzer_rel" }
       builders { name: "linux_msan" }
       builders { name: "linux_rel" }
       builders { name: "linux_tsan2" }