Revert "Add MSVC Dbg/Rel x64 to the CQ."

This reverts commit cfa0edf59251d5e88c292be80cd43675e6c3ff16.

Reason for revert: Makes the CQ fail.

Original change's description:
> Add MSVC Dbg/Rel x64 to the CQ.
>
> Bug: dawn:602
> Change-Id: Idb684a36b0307c14c78b3c9bd23e0154e242b6d6
> Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/38401
> Commit-Queue: Corentin Wallez <cwallez@chromium.org>
> Auto-Submit: Corentin Wallez <cwallez@chromium.org>
> Reviewed-by: Austin Eng <enga@chromium.org>

TBR=cwallez@chromium.org,enga@chromium.org

Change-Id: I1d61c467414b700ee2f8246b6d5d85f324529675
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: dawn:602
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/39000
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
diff --git a/infra/config/global/commit-queue.cfg b/infra/config/global/commit-queue.cfg
index 7ed5611..89dac1f 100644
--- a/infra/config/global/commit-queue.cfg
+++ b/infra/config/global/commit-queue.cfg
@@ -52,12 +52,6 @@
         name: "dawn/try/win-clang-rel-x64"
       }
       builders {
-        name: "dawn/try/win-msvc-dbg-x64"
-      }
-      builders {
-        name: "dawn/try/win-msvc-rel-x64"
-      }
-      builders {
         name: "chromium/try/linux-dawn-rel"
       }
       builders {
diff --git a/infra/config/global/cr-buildbucket.cfg b/infra/config/global/cr-buildbucket.cfg
index 13455e5..509ffe6 100644
--- a/infra/config/global/cr-buildbucket.cfg
+++ b/infra/config/global/cr-buildbucket.cfg
@@ -350,6 +350,7 @@
     }
     # GOMA doesn't support MSVC builds so we don't used the "windows" mixin and
     # instead list the dimensions: "os:Windows-10" directly.
+    # CI Mirror only
     builders {
       name: "win-msvc-dbg-x64"
       dimensions: "os:Windows-10"
@@ -357,6 +358,7 @@
       mixins: "debug"
       mixins: "x64"
     }
+    # CI Mirror only
     builders {
       name: "win-msvc-rel-x64"
       dimensions: "os:Windows-10"