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

chrome/browser/app_controller_mac_browsertest.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 <Carbon/Carbon.h>
 #import <Cocoa/Cocoa.h>
 #import <Foundation/Foundation.h>
 #import <Foundation/NSAppleEventDescriptor.h>
 #import <objc/message.h>
 #import <objc/runtime.h>
@@ skipping 419 matching lines @@
 
 class AppControllerMainMenuBrowserTest : public InProcessBrowserTest {
  protected:
   AppControllerMainMenuBrowserTest() {
   }
 };
 
 IN_PROC_BROWSER_TEST_F(AppControllerMainMenuBrowserTest,
     HistoryMenuResetAfterProfileDeletion) {
   ProfileManager* profile_manager = g_browser_process->profile_manager();
-  AppController* ac = [NSApp delegate];
+  AppController* ac =
+      base::mac::ObjCCastStrict<AppController>([NSApp delegate]);
 
   // Use the existing profile as profile 1.
   Profile* profile1 = browser()->profile();
 
   // Create profile 2.
   base::FilePath profile2_path =
       profile_manager->GenerateNextProfileDirectoryPath();
   base::RunLoop run_loop;
   profile_manager->CreateProfileAsync(
       profile2_path,
@@ skipping 235 matching lines @@
   ui_test_utils::NavigateToURL(browser3, test_url1);
   EXPECT_EQ(g_handoff_url, GURL());
 
   // Activate the original browser window.
   Browser* browser1 = active_browser_list->get(0);
   browser1->window()->Show();
   EXPECT_EQ(g_handoff_url, test_url2);
 }
 
 }  // namespace