Replace MessageLoop::current()->task_runner() with ThreadTaskRunnerHandle::Get().

components/leveldb/leveldb_app.cc

Index: components/leveldb/leveldb_app.cc
diff --git a/components/leveldb/leveldb_app.cc b/components/leveldb/leveldb_app.cc
index b6e2aba543dd678bdfc4e88244d1176bf4ccdb31..55eb5908b4c2c596301fb3f6e2f41bc584f83dcb 100644
--- a/components/leveldb/leveldb_app.cc
+++ b/components/leveldb/leveldb_app.cc
@@ -4,7 +4,7 @@
 
 #include "components/leveldb/leveldb_app.h"
 
-#include "base/message_loop/message_loop.h"
+#include "base/threading/thread_task_runner_handle.h"
 #include "components/leveldb/leveldb_service_impl.h"
 #include "services/shell/public/cpp/interface_registry.h"
 
@@ -27,8 +27,7 @@ bool LevelDBApp::OnConnect(const shell::Identity& remote_identity,
 void LevelDBApp::Create(const shell::Identity& remote_identity,
                         leveldb::mojom::LevelDBServiceRequest request) {
   if (!service_)
-    service_.reset(
-        new LevelDBServiceImpl(base::MessageLoop::current()->task_runner()));
+    service_.reset(new LevelDBServiceImpl(base::ThreadTaskRunnerHandle::Get()));
   bindings_.AddBinding(service_.get(), std::move(request));
 }