[Sync] Mark MigratePrefsAndBoolkmarkThenModifyBookmark as flaky

chrome/browser/sync/test/integration/migration_errors_test.cc

Index: chrome/browser/sync/test/integration/migration_errors_test.cc
diff --git a/chrome/browser/sync/test/integration/migration_errors_test.cc b/chrome/browser/sync/test/integration/migration_errors_test.cc
index cf7cc1516bc022a8c55898e73052b6335d558c35..52bb6b5bc8119e2b4ddd565e6101dbb244eae2da 100644
--- a/chrome/browser/sync/test/integration/migration_errors_test.cc
+++ b/chrome/browser/sync/test/integration/migration_errors_test.cc
@@ -349,8 +349,9 @@ IN_PROC_BROWSER_TEST_F(MigrationTwoClientTest,
 
 // Triggers a server migration on two datatypes, then makes a local
 // modification to one of them.
+// Flaky. crbug.com/100382.
 IN_PROC_BROWSER_TEST_F(MigrationTwoClientTest,
-                       MigratePrefsAndBookmarksThenModifyBookmark) {
+                       FLAKY_MigratePrefsAndBookmarksThenModifyBookmark) {
   RunTwoClientMigrationTest(
       MakeList(syncable::PREFERENCES, syncable::BOOKMARKS),
       MODIFY_BOOKMARK);