Revert "[Extension SW] Enable UninstallSelf test for Service Workers."

This reverts commit b2703ae9.

Reason for revert: The test is very flaky on linux-chromeos-google-rel

Original change's description:
> [Extension SW] Enable UninstallSelf test for Service Workers.
> 
> With SW lifetime fix CL
> (https://chromium-review.googlesource.com/c/chromium/src/+/1832714),
> this test should not fail/flake anymore. This is
> also evident as retrying the test thousand times locally doesn't
> fail.
> 
> Bug: 1003597
> Change-Id: I31f467b10e90e10835f60ebedf6320d40cc7b864
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1933410
> Reviewed-by: David Bertoni <dbertoni@chromium.org>
> Commit-Queue: Istiaque Ahmed <lazyboy@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#719756}

TBR=lazyboy@chromium.org,dbertoni@chromium.org

Change-Id: Ia1747006ad1c1fb33dd3726a987b3cdbb0a9daf4
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1003597
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1942810Reviewed-by: Chris Sharp <csharp@chromium.org>
Commit-Queue: Chris Sharp <csharp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719986}

chrome/browser/extensions/api/management/management_api_non_persistent_apitest.cc

@@ -121,8 +121,9 @@ INSTANTIATE_TEST_SUITE_P(EventPage,
                          ManagementApiNonPersistentApiTest,
                          ::testing::Values(ContextType::kEventPage));
 
-INSTANTIATE_TEST_SUITE_P(ServiceWorker,
-                         ManagementApiNonPersistentApiTest,
-                         ::testing::Values(ContextType::kServiceWorker));
+// Flaky: crbug.com/1003597
+// INSTANTIATE_TEST_SUITE_P(ServiceWorker,
+//                          ManagementApiNonPersistentApiTest,
+//                          ::testing::Values(ContextType::kServiceWorker));
 
 }  // namespace extensions