[Sheriff] Disable flaky LoadAndLaunchExtension on Win

TBR=devlin@chromium.org

BUG=chromium:988160
TEST=None

Change-Id: Idabe57df448c82dcc596c5e1587ea446984e34ff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1724075Reviewed-by: Lutz Justen <ljusten@chromium.org>
Commit-Queue: Lutz Justen <ljusten@chromium.org>
Cr-Commit-Position: refs/heads/master@{#681767}

apps/load_and_launch_browsertest.cc

@@ -11,6 +11,7 @@
 #include "base/stl_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/test/test_timeouts.h"
+#include "build/build_config.h"
 #include "chrome/browser/apps/platform_apps/app_browsertest_util.h"
 #include "chrome/browser/extensions/extension_browsertest.h"
 #include "chrome/browser/extensions/load_error_reporter.h"
@@ -178,8 +179,14 @@ IN_PROC_BROWSER_TEST_F(LoadAndLaunchPlatformAppBrowserTest,
   LoadAndLaunchApp();
 }
 
+// TODO(https://crbug.com/988160): Test is flaky on Windows.
+#if defined(OS_WIN)
+#define MAYBE_LoadAndLaunchExtension DISABLED_LoadAndLaunchExtension
+#else
+#define MAYBE_LoadAndLaunchExtension LoadAndLaunchExtension
+#endif
 IN_PROC_BROWSER_TEST_F(LoadAndLaunchExtensionBrowserTest,
-                       LoadAndLaunchExtension) {
+                       MAYBE_LoadAndLaunchExtension) {
   const std::vector<base::string16>* errors =
       extensions::LoadErrorReporter::GetInstance()->GetErrors();