Fingerprint Progress arc: Re-enable test on non-Mac

This test only appears to have failed in the CL that disabled it on
the Mac bot. Re-enable it for other platforms.

Bug: 1044390
Change-Id: Ic1d6290e7ae2cb9ebfdb6d4d2038cb7a64a3ee7a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2013911Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734102}

chrome/test/data/webui/cr_elements/cr_elements_browsertest.js

@@ -350,7 +350,14 @@ CrElementsFingerprintProgressArcTest.prototype = {
   ]),
 };
 
-TEST_F('CrElementsFingerprintProgressArcTest', 'DISABLED_All', function() {
+// https://crbug.com/1044390 - maybe flaky on Mac?
+GEN('#if defined(OS_MACOSX)');
+GEN('#define MAYBE_Fingerprint DISABLED_Fingerprint');
+GEN('#else');
+GEN('#define MAYBE_Fingerprint Fingerprint');
+GEN('#endif');
+
+TEST_F('CrElementsFingerprintProgressArcTest', 'MAYBE_Fingerprint', function() {
   mocha.run();
 });