[profile-menu] Re-enable browser test _WithUnconsentedPrimaryAccount

... and wait for SyncTransportActive during the setup.

Bug: 995720, 1012167
Change-Id: Ib0523c68738f226a29171fabc64264cf36c03f37
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1856061
Commit-Queue: Thomas Tangl <tangltom@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705126}

chrome/browser/ui/views/profiles/profile_menu_view_browsertest.cc

@@ -894,12 +894,12 @@ constexpr ProfileMenuView::ActionableItem
     ProfileMenuClickTest_WithUnconsentedPrimaryAccount::kOrderedActionableItems
         [];
 
-// TODO(crbug.com/1012167): Flaky.
 IN_PROC_BROWSER_TEST_P(ProfileMenuClickTest_WithUnconsentedPrimaryAccount,
-                       DISABLED_SetupAndRunTest) {
+                       SetupAndRunTest) {
   signin::MakeAccountAvailableWithCookies(identity_manager(),
                                           &test_url_loader_factory_,
                                           "user@example.com", "gaia_id");
+  ASSERT_TRUE(sync_harness()->AwaitSyncTransportActive());
   // Check that the setup was successful.
   ASSERT_FALSE(identity_manager()->HasPrimaryAccount());
   ASSERT_TRUE(identity_manager()->HasUnconsentedPrimaryAccount());