Disable FolderShortcuts/FilesAppBrowserTest on ASan

It's too slow and times out.

TBR=fukino@chromium.org

Bug: 851988
Change-Id: I868d846e3fae5f7dd16b2a2c7203602008221396
Reviewed-on: https://chromium-review.googlesource.com/1104424Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567991}

chrome/browser/chromeos/file_manager/file_manager_browsertest.cc

@@ -323,6 +323,12 @@ WRAPPED_INSTANTIATE_TEST_CASE_P(
                       TestCase("genericTaskIsNotExecuted"),
                       TestCase("genericTaskAndNonGenericTask")));
 
+// TODO(crbug.com/851988): Times out on ASan.
+#if defined(ADDRESS_SANITIZER)
+#define MAYBE_FilesAppBrowserTest DISABLED_FilesAppBrowserTest
+#else
+#define MAYBE_FilesAppBrowserTest FilesAppBrowserTest
+#endif
 WRAPPED_INSTANTIATE_TEST_CASE_P(
     FolderShortcuts, /* folder_shortcuts.js */
     FilesAppBrowserTest,