Standardize usage of virtual/override/final in content/renderer/

content/renderer/gin_browsertest.cc

 // Copyright (c) 2013 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 "base/command_line.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/test/render_view_test.h"
 #include "content/renderer/render_view_impl.h"
 #include "gin/handle.h"
 #include "gin/per_isolate_data.h"
@@ skipping 10 matching lines @@
 class TestGinObject : public gin::Wrappable<TestGinObject> {
  public:
   static gin::WrapperInfo kWrapperInfo;
 
   static gin::Handle<TestGinObject> Create(v8::Isolate* isolate, bool* alive) {
     return gin::CreateHandle(isolate, new TestGinObject(alive));
   }
 
  private:
   TestGinObject(bool* alive) : alive_(alive) { *alive_ = true; }
-  virtual ~TestGinObject() { *alive_ = false; }
+  ~TestGinObject() override { *alive_ = false; }
 
   bool* alive_;
 
   DISALLOW_COPY_AND_ASSIGN(TestGinObject);
 };
 
 gin::WrapperInfo TestGinObject::kWrapperInfo = { gin::kEmbedderNativeGin };
 
 class GinBrowserTest : public RenderViewTest {
  public:
@@ skipping 34 matching lines @@
 
   // Should not crash.
   blink::mainThreadIsolate()->LowMemoryNotification();
 
   CHECK(!alive);
 }
 
 } // namespace
 
 }  // namespace content