Standardize usage of virtual/override/final specifiers.

chrome/browser/printing/print_preview_dialog_controller_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/memory/scoped_ptr.h"
 #include "base/run_loop.h"
 #include "chrome/browser/printing/print_preview_dialog_controller.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_commands.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
@@ skipping 80 matching lines @@
   void WebContentsDestroyed() override { dialog_destroyed_ = true; }
 
   bool dialog_destroyed_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintPreviewDialogDestroyedObserver);
 };
 
 class PrintPreviewDialogControllerBrowserTest : public InProcessBrowserTest {
  public:
   PrintPreviewDialogControllerBrowserTest() : initiator_(NULL) {}
-  virtual ~PrintPreviewDialogControllerBrowserTest() {}
+  ~PrintPreviewDialogControllerBrowserTest() override {}
 
   WebContents* initiator() {
     return initiator_;
   }
 
   void PrintPreview() {
     base::RunLoop run_loop;
     request_preview_dialog_observer()->set_quit_closure(run_loop.QuitClosure());
     chrome::Print(browser());
     run_loop.Run();
@@ skipping 102 matching lines @@
       browser()->tab_strip_model()->GetActiveWebContents());
   ASSERT_TRUE(dialog_destroyed_observer.dialog_destroyed());
 
   // Try printing again.
   PrintPreview();
 
   // Create a preview dialog for the initiator tab.
   WebContents* new_preview_dialog = GetPrintPreviewDialog();
   EXPECT_TRUE(new_preview_dialog);
 }