Mac Chromium style checker cleanup

chrome/browser/ui/cocoa/constrained_window/constrained_window_sheet_controller_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.
 
 #import "chrome/browser/ui/cocoa/constrained_window/constrained_window_sheet_controller.h"
 
 #import "chrome/browser/ui/cocoa/cocoa_test_helper.h"
 #import "chrome/browser/ui/cocoa/constrained_window/constrained_window_custom_sheet.h"
 #import "testing/gtest_mac.h"
 
@@ skipping 48 matching lines @@
 - (void)alertDidEnd:(NSAlert *)alert
          returnCode:(NSInteger)returnCode
             ctxInfo:(void *)contextInfo {
   returnCode_ = returnCode;
 }
 
 @end
 
 class ConstrainedWindowSheetControllerTest : public CocoaTest {
  protected:
-  ~ConstrainedWindowSheetControllerTest() {
+  virtual ~ConstrainedWindowSheetControllerTest() {
   }
 
   virtual void SetUp() OVERRIDE {
     CocoaTest::SetUp();
 
     // Center the window so that the sheet doesn't go offscreen.
     [test_window() center];
 
     // Create two dummy tabs and make the first one active.
     NSRect dummyRect = NSMakeRect(0, 0, 50, 50);
@@ skipping 201 matching lines @@
   [controller_ showSheet:system_sheet
                  forParentView:tab1_];
   EXPECT_FALSE([[alert window] isVisible]);
 
   ActivateTabView(tab1_);
   EXPECT_TRUE([[alert window] isVisible]);
   EXPECT_EQ(1.0, [[alert window] alphaValue]);
 
   [controller_ closeSheet:system_sheet];
 }