Revert "Disable RememberCertDecision test."

This reverts commit 7b9599f6.

Reason for revert: Speculative revert to see if anything changed.

Original change's description:
> Disable RememberCertDecision test.
> 
> TBR=rohitrao@chromium.org
> 
> Bug: 973635
> Change-Id: Ibdd73fa2c40cbea322e22271dc02017cd2d9326a
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1656589
> Reviewed-by: Eugene But <eugenebut@chromium.org>
> Commit-Queue: Eugene But <eugenebut@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#668609}

TBR=rohitrao@chromium.org,eugenebut@chromium.org

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

Bug: 973635
Change-Id: I69295a9f56101678466744e38279a01f814503c2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1729400Reviewed-by: Justin Cohen <justincohen@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682940}

ios/web/web_state/bad_ssl_response_inttest.mm

@@ -191,8 +191,7 @@ TEST_P(BadSslResponseTest, ReadFromSessionCertificateStorage) {
 // Tests navigation to a page with self signed SSL cert and allowing the load
 // via WebClient. Subsequent navigation should not call AllowCertificateError
 // but always allow the load.
-// TODO(crbug.com/973635): fix and reenable this test.
-TEST_P(BadSslResponseTest, DISABLED_RememberCertDecision) {
+TEST_P(BadSslResponseTest, RememberCertDecision) {
   // Allow the load via WebClient.
   web_client()->SetAllowCertificateErrors(true);
   GURL url(https_server_.GetURL("/echo"));