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

content/browser/renderer_host/render_widget_host_view_mac_unittest.mm

 // Copyright (c) 2012 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 "content/browser/renderer_host/render_widget_host_view_mac.h"
 
 #include "base/mac/mac_util.h"
 #include "base/mac/scoped_nsautorelease_pool.h"
 #include "base/mac/sdk_forward_declarations.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 73 matching lines @@
 
 @end
 
 namespace content {
 
 namespace {
 
 class MockRenderWidgetHostDelegate : public RenderWidgetHostDelegate {
  public:
   MockRenderWidgetHostDelegate() {}
-  virtual ~MockRenderWidgetHostDelegate() {}
+  ~MockRenderWidgetHostDelegate() override {}
 };
 
 class MockRenderWidgetHostImpl : public RenderWidgetHostImpl {
  public:
   MockRenderWidgetHostImpl(RenderWidgetHostDelegate* delegate,
                            RenderProcessHost* process,
                            int routing_id)
       : RenderWidgetHostImpl(delegate, process, routing_id, false) {
   }
 
@@ skipping 718 matching lines @@
   // Let |guest_rwhv_weak| have a chance to delete itself.
   base::RunLoop run_loop;
   content::BrowserThread::PostTask(
       content::BrowserThread::UI, FROM_HERE, run_loop.QuitClosure());
   run_loop.Run();
 
   ASSERT_FALSE(guest_rwhv_weak.get());
 }
 
 }  // namespace content