Standardize usage of virtual/override/final specifiers.

ash/accelerators/exit_warning_handler.cc

 // Copyright 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 "ash/accelerators/exit_warning_handler.h"
 
 #include "ash/metrics/user_metrics_recorder.h"
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
 #include "ash/shell_window_ids.h"
@@ skipping 50 matching lines @@
     label->SetHorizontalAlignment(gfx::ALIGN_CENTER);
     label->SetFontList(font_list);
     label->SetEnabledColor(kTextColor);
     label->SetDisabledColor(kTextColor);
     label->SetAutoColorReadabilityEnabled(false);
     label->SetSubpixelRenderingEnabled(false);
     AddChildView(label);
     SetLayoutManager(new views::FillLayout);
   }
 
-  virtual gfx::Size GetPreferredSize() const override {
+  gfx::Size GetPreferredSize() const override {
     return gfx::Size(width_, height_);
   }
 
-  virtual void OnPaint(gfx::Canvas* canvas) override {
+  void OnPaint(gfx::Canvas* canvas) override {
     SkPaint paint;
     paint.setStyle(SkPaint::kFill_Style);
     paint.setColor(kWindowBackgroundColor);
     canvas->DrawRoundRect(GetLocalBounds(), kWindowCornerRadius, paint);
     views::WidgetDelegateView::OnPaint(canvas);
   }
 
-  virtual void GetAccessibleState(ui::AXViewState* state) override {
+  void GetAccessibleState(ui::AXViewState* state) override {
     state->name = accessible_name_;
     state->role = ui::AX_ROLE_ALERT;
   }
 
  private:
   base::string16 text_;
   base::string16 accessible_name_;
   int text_width_;
   int width_;
   int height_;
@@ skipping 86 matching lines @@
   widget_->Show();
 
   delegate->NotifyAccessibilityEvent(ui::AX_EVENT_ALERT, true);
 }
 
 void ExitWarningHandler::Hide() {
   widget_.reset();
 }
 
 }  // namespace ash