Standardize usage of virtual/override/final specifiers.

content/renderer/accessibility/renderer_accessibility_browsertest.cc

 // 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 "base/strings/utf_string_conversions.h"
 #include "base/time/time.h"
 #include "content/common/frame_messages.h"
 #include "content/common/view_message_enums.h"
 #include "content/public/test/render_view_test.h"
 #include "content/renderer/accessibility/renderer_accessibility_complete.h"
@@ skipping 27 matching lines @@
   RendererAccessibilityTest() {}
 
   RenderViewImpl* view() {
     return static_cast<RenderViewImpl*>(view_);
   }
 
   RenderFrameImpl* frame() {
     return static_cast<RenderFrameImpl*>(view()->GetMainRenderFrame());
   }
 
-  virtual void SetUp() {
+  void SetUp() override {
     RenderViewTest::SetUp();
     sink_ = &render_thread_->sink();
   }
 
   void SetMode(AccessibilityMode mode) {
     frame()->OnSetAccessibilityMode(mode);
   }
 
   void GetLastAccEvent(
       AccessibilityHostMsg_EventParams* params) {
@@ skipping 346 matching lines @@
 
   const IPC::Message* message =
       sink_->GetUniqueMessageMatching(AccessibilityHostMsg_Events::ID);
   ASSERT_TRUE(message);
   Tuple2<std::vector<AccessibilityHostMsg_EventParams>, int> param;
   AccessibilityHostMsg_Events::Read(message, &param);
   ASSERT_EQ(0U, param.a.size());
 }
 
 }  // namespace content