mojo: Fix Blink's shutdown sequence in AxProviderImplTest

components/html_viewer/ax_provider_impl_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/html_viewer/ax_provider_impl.h"
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
 #include "components/html_viewer/blink_platform_impl.h"
 #include "components/scheduler/renderer/renderer_scheduler.h"
@@ skipping 29 matching lines @@
 
 class TestWebViewClient : public WebViewClient {
  public:
   bool allowsBrokenNullLayerTreeView() const override { return true; }
   virtual ~TestWebViewClient() {}
 };
 
 class AxProviderImplTest : public testing::Test {
  public:
   AxProviderImplTest()
-      : renderer_scheduler_(scheduler::RendererScheduler::Create()) {
+      : message_loop_(new base::MessageLoopForUI()),
+        renderer_scheduler_(scheduler::RendererScheduler::Create()) {
 #if defined(V8_USE_EXTERNAL_STARTUP_DATA)
     gin::V8Initializer::LoadV8Snapshot();
 #endif
     blink::initialize(
         new html_viewer::BlinkPlatformImpl(nullptr, renderer_scheduler_.get()));
   }
 
-  ~AxProviderImplTest() override { blink::shutdown(); }
+  ~AxProviderImplTest() override {
+    renderer_scheduler_->Shutdown();
+    message_loop_.reset();
+    blink::shutdown();
+  }
 
  private:
-  base::MessageLoopForUI message_loop;
+  scoped_ptr<base::MessageLoopForUI> message_loop_;
   scoped_ptr<scheduler::RendererScheduler> renderer_scheduler_;
 };
 
 struct NodeCatcher {
   void OnNodes(Array<AxNodePtr> nodes) { this->nodes = nodes.Pass(); }
   Array<AxNodePtr> nodes;
 };
 
 AxNodePtr CreateNode(int id,
                      int parent_id,
@@ skipping 111 matching lines @@
                              "",
                              ""));
     }
   }
 
   // TODO(aa): Test bounds.
   // TODO(aa): Test sibling ordering of foo/bar/baz.
 
   view->close();
 }