Revert "Disable SingleClientWalletSyncTest.SameUpdatesAreIgnored on ASan/TSan"

This reverts commit 55420155.

Reason for revert: I have rolled back one suspect change.
Enabling the test again to verify it was indeed the culprit.

Original change's description:
> Disable SingleClientWalletSyncTest.SameUpdatesAreIgnored on ASan/TSan
>
> The test is disabled due to high flakiness.
>
> TBR: treib@chromium.org
> Bug: 997912
> Change-Id: Ifa5e1cc89354163622a6a6ca593498c6fe3a6028
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1771974
> Commit-Queue: Jan Krcal <jkrcal@chromium.org>
> Reviewed-by: Marc Treib <treib@chromium.org>
> Reviewed-by: Jan Krcal <jkrcal@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#690763}

TBR=treib@chromium.org,jkrcal@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 997912
Change-Id: I275345a29e2917d5abe5a402fa03cac0d107703c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1774630Reviewed-by: Mohamed Amir Yosef <mamir@chromium.org>
Commit-Queue: Mohamed Amir Yosef <mamir@chromium.org>
Cr-Commit-Position: refs/heads/master@{#691582}

chrome/browser/sync/test/integration/single_client_wallet_sync_test.cc

@@ -611,14 +611,7 @@ IN_PROC_BROWSER_TEST_F(SingleClientWalletSyncTest,
 
 // If the server sends the same cards and addresses again, they should not
 // change on the client. We should also not overwrite existing metadata.
-// Flaky on ASan/TSan only. http://crbug.com/997912
-#if defined(ADDRESS_SANITIZER) || defined(THREAD_SANITIZER)
-#define MAYBE_SameUpdatesAreIgnored DISABLED_SameUpdatesAreIgnored
-#else
-#define MAYBE_SameUpdatesAreIgnored SameUpdatesAreIgnored
-#endif
-IN_PROC_BROWSER_TEST_F(SingleClientWalletSyncTest,
-                       MAYBE_SameUpdatesAreIgnored) {
+IN_PROC_BROWSER_TEST_F(SingleClientWalletSyncTest, SameUpdatesAreIgnored) {
   GetFakeServer()->SetWalletData(
       {CreateSyncWalletCard(/*name=*/"card-1", /*last_four=*/"0001",
                             kDefaultBillingAddressID),