Disable [FormsTestCase testRepostFormAfterReload].

TBR=eugenebut@chromium.org

Bug: 968296
Change-Id: I54cead2d459a678c6e865ace2ecc42559ebbb7b5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1635293Reviewed-by: Mike Dougherty <michaeldo@chromium.org>
Commit-Queue: Mike Dougherty <michaeldo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664562}

ios/chrome/browser/web/forms_egtest.mm

@@ -206,6 +206,11 @@ id<GREYMatcher> ResendPostButtonMatcher() {
 
 // Tests that a POST followed by reloading the destination page resends data.
 - (void)testRepostFormAfterReload {
+  if (web::GetWebClient()->IsSlimNavigationManagerEnabled()) {
+    // TODO(crbug.com/968296): Re-enable this test.
+    EARL_GREY_TEST_DISABLED(@"Test disabled with Slim Navigation.");
+  }
+
   [self setUpFormTestSimpleHttpServer];
   const GURL destinationURL = GetDestinationUrl();