[Autofill] Fix CreditCardSaveManager unittests.

Bug: 790996
Change-Id: Ida50f82021a0cbb10306c4ee522367b500ccac16
Reviewed-on: https://chromium-review.googlesource.com/806718
Commit-Queue: Sebastien Seguin-Gagnon <sebsg@chromium.org>
Reviewed-by: Mathieu Perreault <mathp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521707}

components/autofill/core/browser/BUILD.gn

@@ -383,9 +383,7 @@ source_set("unit_tests") {
     "country_combobox_model_unittest.cc",
     "country_names_unittest.cc",
     "credit_card_field_unittest.cc",
-    # credit_card_save_manager_unittests flaking on all platforms
-    # TODO(holte): crbug.com/790953
-    # "credit_card_save_manager_unittest.cc",
+    "credit_card_save_manager_unittest.cc",
     "credit_card_unittest.cc",
     "field_candidates_unittest.cc",
     "field_filler_unittest.cc",