Fix another virtual specifier.

mojo/services/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 "mojo/services/html_viewer/ax_provider_impl.h"
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
 #include "gin/public/isolate_holder.h"
 #include "mojo/services/html_viewer/blink_platform_impl.h"
@@ skipping 34 matching lines @@
 
 class AxProviderImplTest : public testing::Test {
  public:
   AxProviderImplTest() {
 #if defined(V8_USE_EXTERNAL_STARTUP_DATA)
     gin::IsolateHolder::LoadV8Snapshot();
 #endif
     blink::initialize(new html_viewer::BlinkPlatformImpl());
   }
 
-  virtual ~AxProviderImplTest() override { blink::shutdown(); }
+  ~AxProviderImplTest() override { blink::shutdown(); }
 
  private:
   base::MessageLoopForUI message_loop;
 };
 
 struct NodeCatcher {
   void OnNodes(Array<AxNodePtr> nodes) { this->nodes = nodes.Pass(); }
   Array<AxNodePtr> nodes;
 };
 
@@ skipping 103 matching lines @@
                              "",
                              ""));
     }
   }
 
   // TODO(aa): Test bounds.
   // TODO(aa): Test sibling ordering of foo/bar/baz.
 
   view->close();
 }