Revert "Temporarily disabling CQ due to infrastructure problems."

infra/config/cq_disabled.cfg

-# Commit Queue configuration file. The documentation of the format can be found
-# at http://luci-config.appspot.com/schemas/projects/refs:cq.cfg.
-
-version: 1
-cq_name: "webrtc"
-cq_status_url: "https://chromium-cq-status.appspot.com"
-commit_burst_delay: 60
-max_commit_burst: 1
-hide_ref_in_committed_msg: true
-target_ref: "refs/pending/heads/master"
-
-rietveld {
-  url: "https://codereview.webrtc.org"
-}
-
-
-verifiers {
-  reviewer_lgtm {
-    committer_list: "webrtc"
-  }
-
-  tree_status {
-    tree_status_url: "https://webrtc-status.appspot.com"
-  }
-
-  try_job {
-    buckets {
-      name: "tryserver.webrtc"
-      builders { name: "android" }
-      builders { name: "android_arm64_rel" }
-      builders { name: "android_clang" }
-      builders { name: "android_gn" }
-      builders { name: "android_gn_rel" }
-      builders { name: "android_rel" }
-      builders { name: "ios" }
-      builders { name: "ios_arm64" }
-      builders { name: "ios_arm64_rel" }
-      builders { name: "ios_rel" }
-      builders { name: "ios32_sim" }
-      builders { name: "ios64_sim" }
-      builders { name: "linux" }
-      builders { name: "linux_asan" }
-      builders { name: "linux_baremetal" }
-      builders { name: "linux_gn" }
-      builders { name: "linux_gn_rel" }
-      builders { name: "linux_msan" }
-      builders { name: "linux_rel" }
-      builders { name: "linux_tsan2" }
-      builders { name: "mac" }
-      builders { name: "mac_asan" }
-      builders { name: "mac_baremetal" }
-      builders { name: "mac_rel" }
-      builders { name: "mac_x64" }
-      builders { name: "mac_x64_gn" }
-      builders { name: "mac_x64_gn_rel" }
-      builders { name: "mac_x64_rel" }
-      builders { name: "presubmit" }
-      builders { name: "win" }
-      builders { name: "win_baremetal" }
-      builders { name: "win_rel" }
-      builders { name: "win_x64_gn" }
-      builders { name: "win_x64_gn_rel" }
-      builders { name: "win_x64_rel" }
-      builders { name: "win_drmemory_light" }
-    }
-  }
-}