Plug temp dir leaks in StrikeDatabaseIntegratorTestStrikeDatabaseTest.

The LevelDB provider must also be destroyed before tasks are run to
release all resources.

BUG=546640

Change-Id: I5e4043d5a9cad66513b2199ec30f996c5f188770
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1940240
Auto-Submit: Greg Thompson <grt@chromium.org>
Reviewed-by: Jared Saul <jsaul@google.com>
Commit-Queue: Jared Saul <jsaul@google.com>
Cr-Commit-Position: refs/heads/master@{#720259}

components/autofill/core/browser/payments/strike_database_integrator_test_strike_database_unittest.cc

@@ -43,13 +43,14 @@ class StrikeDatabaseIntegratorTestStrikeDatabaseTest : public ::testing::Test {
     // to a task runner, requires running the loop to complete.
     strike_database_.reset();
     strike_database_service_.reset();
+    db_provider_.reset();
     task_environment_.RunUntilIdle();
   }
 
  protected:
   base::HistogramTester* GetHistogramTester() { return &histogram_tester_; }
-  base::test::TaskEnvironment task_environment_;
   base::ScopedTempDir temp_dir_;
+  base::test::TaskEnvironment task_environment_;
   std::unique_ptr<leveldb_proto::ProtoDatabaseProvider> db_provider_;
   std::unique_ptr<StrikeDatabase> strike_database_service_;
   std::unique_ptr<StrikeDatabaseIntegratorTestStrikeDatabase> strike_database_;