Fix use-after-move in //content/shell/browser/web_test/web_test_control_host.cc

Fix use-after-move (potential) bugs found by the
"bugprone-use-after-move" clang-tidy check.

Bug: 1122844
Change-Id: I8a1236c9a5f88ae44274557a59fb21605e4591b7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2382853Reviewed-by: danakj <danakj@chromium.org>
Commit-Queue: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803516}

content/shell/browser/web_test/web_test_control_host.cc

@@ -1579,9 +1579,9 @@ void WebTestControlHost::ClearAllDatabases() {
   scoped_refptr<storage::DatabaseTracker> db_tracker =
       base::WrapRefCounted(storage_partition->GetDatabaseTracker());
 
-  db_tracker->task_runner()->PostTask(
-      FROM_HERE,
-      base::BindOnce(run_on_database_sequence, std::move(db_tracker)));
+  base::SequencedTaskRunner* task_runner = db_tracker->task_runner();
+  task_runner->PostTask(FROM_HERE, base::BindOnce(run_on_database_sequence,
+                                                  std::move(db_tracker)));
 }
 
 void WebTestControlHost::SimulateWebNotificationClick(