Revert "[Sheriff] Disable testPaymentsIntegration... test"

This reverts commit 98c28cee.

Reason for revert: Disabled the wrong test (Disables vs Enables).

Original change's description:
> [Sheriff] Disable testPaymentsIntegration... test
> 
> Disables
>   org.chromium.chrome.browser.sync.ManageSyncPreferencesTest
>     #testPaymentsIntegrationCheckboxEnablesPaymentsIntegration
> on Android. It's flaky on Nexus 5 devices.
> 
> TBR=triploblastic@chromium.org,sahel@chromium.org
> 
> BUG=chromium:987827
> TEST=None
> 
> Change-Id: If5bc156d28dc19f34d6bf2cf13e10ddb2d4ff4a1
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1722961
> Commit-Queue: Lutz Justen <ljusten@chromium.org>
> Reviewed-by: Lutz Justen <ljusten@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#681773}

TBR=ljusten@chromium.org,sahel@chromium.org,triploblastic@chromium.org

Change-Id: I14e5669f2bedfdea6d27eefc2da7c53ba8051da7
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:987827
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1724756Reviewed-by: Lutz Justen <ljusten@chromium.org>
Commit-Queue: Lutz Justen <ljusten@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682175}

chrome/android/javatests/src/org/chromium/chrome/browser/sync/ManageSyncPreferencesTest.java

@@ -166,7 +166,6 @@ public class ManageSyncPreferencesTest {
     @Test
     @SmallTest
     @Feature({"Sync"})
-    @DisabledTest(message = "https://crbug.com/987827")
     public void testPaymentsIntegrationCheckboxDisablesPaymentsIntegration() {
         mSyncTestRule.setUpTestAccountAndSignIn();
         mSyncTestRule.setPaymentsIntegrationEnabled(true);