[Sheriff] Disable ZipFiles/FilesAppBrowserTest.Test?*

These are flaky consistently and causing trouble for dozens of CLs on
the CQ.

Bug: 891116
Change-Id: Ib9b82f68e9868d18f05edb59a203ee11f430c8e6

TBR=noel@chromium.org

Change-Id: Ib9b82f68e9868d18f05edb59a203ee11f430c8e6
Reviewed-on: https://chromium-review.googlesource.com/1257547Reviewed-by: Stephen McGruer <smcgruer@chromium.org>
Commit-Queue: Stephen McGruer <smcgruer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595941}

chrome/browser/chromeos/file_manager/file_manager_browsertest.cc

@@ -230,7 +230,8 @@ WRAPPED_INSTANTIATE_TEST_CASE_P(
 #if defined(ADDRESS_SANITIZER)
 #define MAYBE_ZipFiles DISABLED_ZipFiles
 #else
-#define MAYBE_ZipFiles ZipFiles
+// ZipFiles tests are flaking consistently: http://crbug.com/891116
+#define MAYBE_ZipFiles DISABLED_ZipFiles
 #endif
 WRAPPED_INSTANTIATE_TEST_CASE_P(
     MAYBE_ZipFiles, /* zip_files.js */