Re-add TODO that was mistakenly removed in crrev.com/c/2455206

Change-Id: I147b5bc188428802a6be8ed82347633ae57a8dd0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2462882
Auto-Submit: Glen Robertson <glenrob@chromium.org>
Commit-Queue: Alexey Baskakov <loyso@chromium.org>
Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815476}

chrome/browser/web_applications/components/install_finalizer_unittest.cc

@@ -34,6 +34,8 @@ struct FinalizeInstallResult {
 
 }  // namespace
 
+// TODO(crbug.com/1068081): Migrate remaining tests from
+// bookmark_app_install_finalizer_unittest.
 class InstallFinalizerUnitTest : public WebAppTest {
  public:
   InstallFinalizerUnitTest() = default;