Revert "Temporarily remove win_clang from the CQ."

This reverts commit 9d414af.

Reason for revert: I don't think this helped much, since this doesn't run tests. We probably need to shed load elsewhere instead.

Original change's description:
> Temporarily remove win_clang from the CQ.
> 
> As part of debugging what's going on with the slowness
> of the isolate_tests step in crbug.com/748261 I want
> to reduce the overall load of stuff going into the
> golo, so this CL temporarily removes the win_clang
> (which is really msvs) bots from the CQ.
> 
> TBR=thakis@chromium.org, hinoka@chromium.org
> NOTRY=true
> BUG=748261, 753184
> 
> Change-Id: I2b85a5a1a53ae9046855a2b13a95e58f40b3d218
> Reviewed-on: https://chromium-review.googlesource.com/609449
> Reviewed-by: Nico Weber <thakis@chromium.org>
> Reviewed-by: Dirk Pranke <dpranke@chromium.org>
> Commit-Queue: Dirk Pranke <dpranke@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#493178}

TBR=thakis@chromium.org,hinoka@chromium.org,dpranke@chromium.org

Change-Id: Ifb302f719e5dd3a7e1082fa5ec74ff68d05933f5
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 748261, 753184
Reviewed-on: https://chromium-review.googlesource.com/610480
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#493398}

infra/config/cq.cfg

@@ -95,9 +95,7 @@ verifiers {
       builders { name: "win_chromium_compile_dbg_ng" }
       builders { name: "win_chromium_rel_ng" }
       builders { name: "win_chromium_x64_rel_ng" }
-      # https://crbug.com/753184 temporarily disable this builder to
-      # shed load (?)
-      # builders { name: "win_clang" }
+      builders { name: "win_clang" }
     }
   }