[Flaky tests] Disable MaterialHistoryListTest.All on Windows

TBR=rbpotter@chromium.org

Bug: 881685
Change-Id: I26cf5783d26d7dfadd53b1db890b09d14fb09a7e
Reviewed-on: https://chromium-review.googlesource.com/1216625
Commit-Queue: Gabriel Charette <gab@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590000}

chrome/test/data/webui/md_history/md_history_browsertest.js

@@ -100,6 +100,9 @@ MaterialHistoryListTest.prototype = {
 // to load in a Debug build. See https://crbug.com/669227.
 GEN('#if !defined(NDEBUG) || defined(OS_MACOSX) || defined(OS_CHROMEOS)');
 GEN('#define MAYBE_All DISABLED_All');
+// Flakes on OS_WIN: https://crbug.com/881685
+GEN('#elif defined(OS_WIN)');
+GEN('#define MAYBE_All DISABLED_All');
 GEN('#else');
 GEN('#define MAYBE_All All');
 GEN('#endif');