Speculatively enable UserImageManagerPolicyTest.SetAndClear

Bug: 396352
Test: run locally
Change-Id: I210e3ae974ca0170e2cc04838c1c15628baa74bd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1892777Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Commit-Queue: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711256}

chrome/browser/chromeos/login/users/avatar/user_image_manager_browsertest.cc

@@ -710,8 +710,7 @@ IN_PROC_BROWSER_TEST_F(UserImageManagerPolicyTest, PRE_SetAndClear) {
 // Verifies that the user image can be set through policy. Also verifies that
 // after the policy has been cleared, the user is able to choose a different
 // image.
-// http://crbug.com/396352
-IN_PROC_BROWSER_TEST_F(UserImageManagerPolicyTest, DISABLED_SetAndClear) {
+IN_PROC_BROWSER_TEST_F(UserImageManagerPolicyTest, SetAndClear) {
   const user_manager::User* user =
       user_manager::UserManager::Get()->FindUser(enterprise_account_id_);
   ASSERT_TRUE(user);