Disable Providers/FilesAppBrowserTest.Test on Chrome OS

...due to a high amount of flakes.

TBR=noel@chromium.org

Bug: 891119
Change-Id: I2b13e7542bbd4cb4e827ab049f761c0f6eb73fc1
Reviewed-on: https://chromium-review.googlesource.com/c/1264539Reviewed-by: Martin Šrámek <msramek@chromium.org>
Commit-Queue: Martin Šrámek <msramek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#597091}

chrome/browser/chromeos/file_manager/file_manager_browsertest.cc

@@ -619,6 +619,12 @@ WRAPPED_INSTANTIATE_TEST_CASE_P(
                       TestCase("showGridViewDrive"),
                       TestCase("showGridViewDrive").EnableDriveFs()));
 
+// TODO(crbug.com/891119): Flaky on Chrome OS.
+#if defined(OS_CHROMEOS)
+#define MAYBE_Providers DISABLED_Providers
+#else
+#define MAYBE_Providers Providers
+#endif
 WRAPPED_INSTANTIATE_TEST_CASE_P(
     Providers, /* providers.js */
     FilesAppBrowserTest,