[sheriff] Disable NaClBrowserTestPnacl.ValidationCacheOfTranslatorNexes on Windows.

TBR=fdoray@chromium.org

Bug: 1059468
Change-Id: I050e2d843fc1c303944dd7be4483423d793b0d6b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2229424Reviewed-by: François Doray <fdoray@chromium.org>
Reviewed-by: Derek Schuff <dschuff@chromium.org>
Commit-Queue: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774797}

chrome/test/nacl/nacl_browsertest_uma.cc

@@ -259,6 +259,13 @@ IN_PROC_BROWSER_TEST_F(NaClBrowserTestGLibcVcacheExtension,
 
 // Test that validation for the 2 (or 3) PNaCl translator nexes can be cached.
 // This includes pnacl-llc.nexe, pnacl-ld.nexe, and possibly pnacl-sz.nexe.
+// Flaky on Windows https://crbug.com/1059468#c18
+#if defined(OS_WIN)
+#define MAYBE_ValidationCacheOfTranslatorNexes \
+  DISABLED_ValidationCacheOfTranslatorNexes
+#else
+#define MAYBE_ValidationCacheOfTranslatorNexes ValidationCacheOfTranslatorNexes
+#endif
 IN_PROC_BROWSER_TEST_F(NaClBrowserTestPnacl,
                        ValidationCacheOfTranslatorNexes) {
   const bool uses_subzero_with_o0 = IsSubzeroSupportedForArch();