Remove win toolchain from msvc builds

Tripping a check related to not using goma on these builds.

BUG=tint:693

Change-Id: Ibcb20a5707abe887628ef41f12383bb0fae396e9
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/51600
Auto-Submit: Ryan Harrison <rharrison@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Ryan Harrison <rharrison@chromium.org>
Commit-Queue: Ben Clayton <bclayton@google.com>
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
diff --git a/infra/config/global/cr-buildbucket.cfg b/infra/config/global/cr-buildbucket.cfg
index 22354e0..a770248 100644
--- a/infra/config/global/cr-buildbucket.cfg
+++ b/infra/config/global/cr-buildbucket.cfg
@@ -224,10 +224,6 @@
       mixins: "no_clang"
       mixins: "debug"
       mixins: "x64"
-      caches {
-        path: "win_toolchain"
-        name: "win_toolchain"
-      }
     }
     builders {
       name: "win-msvc-rel-x64"
@@ -235,10 +231,6 @@
       mixins: "no_clang"
       mixins: "release"
       mixins: "x64"
-      caches {
-        path: "win_toolchain"
-        name: "win_toolchain"
-      }
     }
   }
 }
@@ -368,10 +360,6 @@
       mixins: "no_clang"
       mixins: "debug"
       mixins: "x64"
-      caches {
-        path: "win_toolchain"
-        name: "win_toolchain"
-      }
     }
     # CI Mirror only
     builders {
@@ -380,10 +368,6 @@
       mixins: "no_clang"
       mixins: "release"
       mixins: "x64"
-      caches {
-        path: "win_toolchain"
-        name: "win_toolchain"
-      }
     }
   }
 }