Mac: Fix SDK 10.11 Compile errors after clang roll in r387792

chrome/browser/ui/cocoa/bookmarks/bookmark_menu_cocoa_controller.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/bookmarks/bookmark_menu_cocoa_controller.h"
 
+#import "base/mac/foundation_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "chrome/app/chrome_command_ids.h"  // IDC_BOOKMARK_MENU
 #import "chrome/browser/app_controller_mac.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/bookmarks/bookmark_utils.h"
 #include "chrome/browser/ui/bookmarks/bookmark_utils_desktop.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_finder.h"
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_menu_bridge.h"
 #import "chrome/browser/ui/cocoa/l10n_util.h"
@@ skipping 47 matching lines @@
   if ([[self menu] delegate] == self)
     [[self menu] setDelegate:nil];
   [super dealloc];
 }
 
 - (NSMenu*)menu {
   return menu_;
 }
 
 - (BOOL)validateMenuItem:(NSMenuItem*)menuItem {
-  AppController* controller = [NSApp delegate];
+  AppController* controller =
+      base::mac::ObjCCastStrict<AppController>([NSApp delegate]);
   return ![controller keyWindowIsModal];
 }
 
 // NSMenu delegate method: called just before menu is displayed.
 - (void)menuNeedsUpdate:(NSMenu*)menu {
   bridge_->UpdateMenu(menu);
 }
 
 // Return the a BookmarkNode that has the given id (called
 // "identifier" here to avoid conflict with objc's concept of "id").
@@ skipping 62 matching lines @@
 
 - (IBAction)openAllBookmarksNewWindow:(id)sender {
   [self openAll:[sender tag] withDisposition:NEW_WINDOW];
 }
 
 - (IBAction)openAllBookmarksIncognitoWindow:(id)sender {
   [self openAll:[sender tag] withDisposition:OFF_THE_RECORD];
 }
 
 @end  // BookmarkMenuCocoaController