Update {virtual,override} to follow C++11 style in chrome.

chrome/browser/ui/cocoa/extensions/media_galleries_dialog_cocoa_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 "base/strings/string_number_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/media_galleries/media_galleries_dialog_controller_mock.h"
 #include "chrome/browser/ui/cocoa/extensions/media_galleries_dialog_cocoa.h"
 #include "components/storage_monitor/storage_info.h"
 #include "extensions/common/extension.h"
@@ skipping 32 matching lines @@
   gallery.device_id = storage_monitor::StorageInfo::MakeDeviceId(
       storage_monitor::StorageInfo::FIXED_MASS_STORAGE,
       base::Int64ToString(pref_id));
   gallery.display_name = base::ASCIIToUTF16("name");
   return gallery;
 }
 
 class MediaGalleriesDialogTest : public testing::Test {
  public:
   MediaGalleriesDialogTest() {}
-  virtual ~MediaGalleriesDialogTest() {}
+  ~MediaGalleriesDialogTest() override {}
 
-  virtual void SetUp() override {
+  void SetUp() override {
     std::vector<base::string16> headers;
     headers.push_back(base::string16());
     headers.push_back(base::ASCIIToUTF16("header2"));
     ON_CALL(controller_, GetSectionHeaders()).
         WillByDefault(Return(headers));
     EXPECT_CALL(controller_, GetSectionEntries(_)).
         Times(AnyNumber());
   }
 
-  virtual void TearDown() override {
+  void TearDown() override {
     Mock::VerifyAndClearExpectations(&controller_);
     dialog_.reset();
   }
 
   NiceMock<MediaGalleriesDialogControllerMock>* controller() {
     return &controller_;
   }
 
   MediaGalleriesDialogCocoa* GetOrCreateDialog() {
     if (!dialog_.get()) {
@@ skipping 124 matching lines @@
   // Remove a gallery.
   attached_permissions.erase(attached_permissions.begin());
   GetOrCreateDialog()->UpdateGalleries();
   EXPECT_EQ(1U, [[GetOrCreateDialog()->checkbox_container_ subviews] count]);
 
   // The checkbox container should be shorter.
   CGFloat new_container_height =
       NSHeight([GetOrCreateDialog()->checkbox_container_ frame]);
   EXPECT_LT(new_container_height, old_container_height);
 }