Revert "Disable DownloadCallbackTest.testBasic on Android"

This reverts commit 98a0a1d3.

Reason for revert: Seems this should be fixed by crrev.com/c/2354124.

Original change's description:
> Disable DownloadCallbackTest.testBasic on Android
> 
> org.chromium.weblayer.test.DownloadCallbackTest.testBasic fails on
> Android,
> https://analysis.chromium.org/p/chromium/flake-portal/flakes/
> occurrences?key=ag9zfmZpbmRpdC1mb3ItbWVybwsSBUZsYWtlImRjaHJvbWl1bUB3ZWJs
> YXllcl9pbnN0cnVtZW50YXRpb25fdGVzdF9hcGtAb3JnLmNocm9taXVtLndlYmxheWVyLnRl
> c3QuRG93bmxvYWRDYWxsYmFja1Rlc3QjdGVzdEJhc2ljDA,
> disable it for now until it is fixed.
> 
> TBR=jam@chromium.org
> 
> Bug: 1116248
> Change-Id: I24f0ab8414f4b17ff3689f3686e3f58682c48b37
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2354162
> Reviewed-by: Lan Wei <lanwei@chromium.org>
> Commit-Queue: Lan Wei <lanwei@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#797990}

TBR=jam@chromium.org,lanwei@chromium.org

Change-Id: I0c18d0e319ee49770b5e453af435d22a5a0a182f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1116248, 1116311
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2357637Reviewed-by: Clark DuVall <cduvall@chromium.org>
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798284}

weblayer/browser/android/javatests/src/org/chromium/weblayer/test/DownloadCallbackTest.java

@@ -18,7 +18,6 @@ import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
-import org.chromium.base.test.util.DisabledTest;
 import org.chromium.content_public.browser.test.util.Criteria;
 import org.chromium.content_public.browser.test.util.CriteriaHelper;
 import org.chromium.content_public.browser.test.util.TestThreadUtils;
@@ -198,7 +197,6 @@ public class DownloadCallbackTest {
 
     @Test
     @SmallTest
-    @DisabledTest(message = "Flaky - https://crbug.com/1116248")
     public void testBasic() {
         String url = mActivityTestRule.getTestDataURL("content-disposition.html");
         TestThreadUtils.runOnUiThreadBlocking(