Disabling CrSettingsAppManagementPageTest.All

Deterministic failure on linux-chromeos-dbg:
https://ci.chromium.org/p/chromium/builders/ci/linux-chromeos-dbg/13059

TBR=dpapad@chromium.org
TBR=jshikaram@chromium.org

Bug: 979553
Change-Id: Ie4f13c4b30c8ff83e0b2909e623f5571099fc688
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1681759Reviewed-by: Sergey Poromov <poromov@chromium.org>
Commit-Queue: Sergey Poromov <poromov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#673269}

chrome/test/data/webui/settings/cr_settings_browsertest.js

@@ -250,7 +250,8 @@ CrSettingsAppManagementPageTest.prototype = {
   ]),
 };
 
-TEST_F('CrSettingsAppManagementPageTest', 'All', function() {
+// TODO(https://crbug.com/979553) Disabled due to failures .
+TEST_F('CrSettingsAppManagementPageTest', 'DISABLED_All', function() {
   mocha.run();
 });
 GEN('#endif  // defined(OS_CHROMEOS)');