[MacViews] Fix AccessiblePaneViewTest.SetPaneFocusAndRestore.

chrome/browser/ui/test/scoped_fake_nswindow_main_status.mm

-// Copyright 2015 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/test/scoped_fake_nswindow_main_status.h"
-
-#import <Cocoa/Cocoa.h>
-
-#import "base/mac/foundation_util.h"
-#import "base/mac/scoped_objc_class_swizzler.h"
-
-namespace {
-
-NSWindow* g_fake_main_window = nil;
-
-}
-
-// Donates a testing implementation of [NSWindow isMainWindow].
-@interface IsMainWindowDonorForWindow : NSObject
-@end
-
-@implementation IsMainWindowDonorForWindow
-- (BOOL)isMainWindow {
-  NSWindow* selfAsWindow = base::mac::ObjCCastStrict<NSWindow>(self);
-  return selfAsWindow == g_fake_main_window;
-}
-@end
-
-ScopedFakeNSWindowMainStatus::ScopedFakeNSWindowMainStatus(NSWindow* window)
-    : swizzler_(new base::mac::ScopedObjCClassSwizzler(
-          [NSWindow class],
-          [IsMainWindowDonorForWindow class],
-          @selector(isMainWindow))) {
-  DCHECK(!g_fake_main_window);
-  g_fake_main_window = window;
-  [[NSNotificationCenter defaultCenter]
-      postNotificationName:NSWindowDidBecomeMainNotification
-                    object:g_fake_main_window];
-}
-
-ScopedFakeNSWindowMainStatus::~ScopedFakeNSWindowMainStatus() {
-  NSWindow* window = g_fake_main_window;
-  g_fake_main_window = nil;
-  [[NSNotificationCenter defaultCenter]
-      postNotificationName:NSWindowDidResignMainNotification
-                    object:window];
-}