[privacy_budget] Remove obsolete comment.

R=caraitto@chromium.org

Bug: 973801
Change-Id: Ice5b139becd3af1c163246d1fe2139c0bccc8c01
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2370602Reviewed-by: Caleb Raitto <caraitto@chromium.org>
Commit-Queue: Asanka Herath <asanka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801051}

chrome/browser/privacy_budget/privacy_budget_ukm_entry_filter_unittest.cc

@@ -56,7 +56,6 @@ TEST(PrivacyBudgetUkmEntryFilterStandaloneTest,
   EXPECT_TRUE(filtered.empty());
 }
 
-// TODO(crbug.com/1117358) Flaky
 TEST(PrivacyBudgetUkmEntryFilterStandaloneTest, AllowsOtherMetricsByDefault) {
   IdentifiabilityStudyState::ResetStateForTesting();
   TestingPrefServiceSimple pref_service;