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

chrome/browser/ui/cocoa/applescript/bookmark_node_applescript.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/applescript/bookmark_node_applescript.h"
 
 #include "base/logging.h"
+#import "base/mac/foundation_util.h"
 #import "base/mac/scoped_nsobject.h"
 #include "base/strings/sys_string_conversions.h"
 #import "chrome/browser/app_controller_mac.h"
 #include "chrome/browser/bookmarks/bookmark_model_factory.h"
 #import "chrome/browser/chrome_browser_application_mac.h"
 #include "chrome/browser/profiles/profile.h"
 #import "chrome/browser/ui/cocoa/applescript/bookmark_item_applescript.h"
 #import "chrome/browser/ui/cocoa/applescript/error_applescript.h"
 #include "components/bookmarks/browser/bookmark_model.h"
 
@@ skipping 89 matching lines @@
 }
 
 - (NSNumber*)index {
   const BookmarkNode* parent = bookmarkNode_->parent();
   int index = parent->GetIndexOf(bookmarkNode_);
   // NOTE: AppleScript is 1-Based.
   return [NSNumber numberWithInt:index+1];
 }
 
 - (BookmarkModel*)bookmarkModel {
-  AppController* appDelegate = [NSApp delegate];
+  AppController* appDelegate =
+      base::mac::ObjCCastStrict<AppController>([NSApp delegate]);
 
   Profile* lastProfile = [appDelegate lastProfile];
   if (!lastProfile) {
     AppleScript::SetError(AppleScript::errGetProfile);
     return NULL;
   }
 
   BookmarkModel* model = BookmarkModelFactory::GetForProfile(lastProfile);
   if (!model->loaded()) {
     AppleScript::SetError(AppleScript::errBookmarkModelLoad);
     return NULL;
   }
 
   return model;
 }
 
 @end