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

chrome/browser/chrome_browser_main_mac.mm

Index: chrome/browser/chrome_browser_main_mac.mm
diff --git a/chrome/browser/chrome_browser_main_mac.mm b/chrome/browser/chrome_browser_main_mac.mm
index 3bf08bedde2ab6faa7983080255499ba059c5b60..3f4781255bf8f9d585b5a4450686e235947e24d1 100644
--- a/chrome/browser/chrome_browser_main_mac.mm
+++ b/chrome/browser/chrome_browser_main_mac.mm
@@ -10,6 +10,7 @@
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/mac/bundle_locations.h"
+#import "base/mac/foundation_util.h"
 #include "base/mac/mac_util.h"
 #include "base/mac/scoped_nsobject.h"
 #include "base/path_service.h"
@@ -204,6 +205,7 @@ void ChromeBrowserMainPartsMac::PostProfileInit() {
 }
 
 void ChromeBrowserMainPartsMac::DidEndMainMessageLoop() {
-  AppController* appController = [NSApp delegate];
+  AppController* appController =
+      base::mac::ObjCCastStrict<AppController>([NSApp delegate]);
   [appController didEndMainMessageLoop];
 }