Reland "[Sheriff] Disable SingleProcessBrowserTest.Test on Win."

This reverts commit 679d952d.

Reason for revert: https://bugs.chromium.org/p/chromium/issues/detail?id=987448#c31

Original change's description:
> Revert "[Sheriff] Disable SingleProcessBrowserTest.Test on Win."
> 
> This reverts commit 2a6e4af1.
> 
> Reason for revert: The test should no longer be flaky on Windows.
> 
> Original change's description:
> > [Sheriff] Disable SingleProcessBrowserTest.Test on Win.
> > 
> > Flaky.
> > 
> > TBR=rockot@google.com
> > 
> > Bug: 987448
> > Change-Id: I6db59e7ce6ac618320e10bfe85b1aa700e0fbce1
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1730902
> > Reviewed-by: vitaliii <vitaliii@chromium.org>
> > Commit-Queue: vitaliii <vitaliii@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#683173}
> 
> TBR=rockot@google.com,vitaliii@chromium.org
> 
> # Not skipping CQ checks because original CL landed > 1 day ago.
> 
> Bug: 987448
> Change-Id: Ia37df33292f76bf965d07da3168933586e564061
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1736439
> Reviewed-by: Ken Rockot <rockot@google.com>
> Commit-Queue: Ken Rockot <rockot@google.com>
> Cr-Commit-Position: refs/heads/master@{#684053}

TBR=rockot@google.com,vitaliii@chromium.org

Change-Id: I3b1083a892df5cfa536f3553082b27f31acfdbd5
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 987448
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1738562Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#684333}

chrome/test/base/in_process_browser_test_browsertest.cc

@@ -105,8 +105,9 @@ class SingleProcessBrowserTest : public InProcessBrowserTest {
   }
 };
 
-#if defined(OS_LINUX)
-// TODO(https://crbug.com/931233): Reenable
+#if defined(OS_LINUX) || defined(OS_WIN)
+// TODO(https://crbug.com/931233): Reenable on Linux.
+// TODO(https://crbug.com/987448): Reenable on Windows.
 #define MAYBE_Test DISABLED_Test
 #else
 #define MAYBE_Test Test