Adding win_asan to CQ.

The Chromium Roll https://webrtc-review.googlesource.com/24760
introduced a breakage on win_asan. In order to re-enable the roll
we have to be protected against these kind of failures.

Bug: webrtc:8562
Change-Id: I8de6268eb1d3f87cba53889f1ae2397b3dbf491e
No-Try: True
Reviewed-on: https://webrtc-review.googlesource.com/25080
Reviewed-by: Patrik Höglund <[email protected]>
Reviewed-by: Oleh Prypin <[email protected]>
Commit-Queue: Mirko Bonadei <[email protected]>
Cr-Commit-Position: refs/heads/master@{#20826}

infra/config/cq.cfg

@@ -63,6 +63,7 @@ verifiers {
       builders { name: "mac_compile_dbg" }
       builders { name: "mac_rel" }
       builders { name: "presubmit" }
+      builders { name: "win_asan" }
       builders { name: "win_baremetal" }
       builders { name: "win_clang_dbg" }
       builders { name: "win_clang_rel" }