Build breaks as titled.
../../ui/base/cocoa/touch_bar_forward_declarations.h:121:15: error: not currently inside '#pragma clang assume_nonnull'
#pragma clang assume_nonnull end
diff --git a/ui/base/cocoa/touch_bar_forward_declarations.h b/ui/base/cocoa/touch_bar_forward_declarations.h
index ce03c6aae01f..82136f279098 100644
--- a/ui/base/cocoa/touch_bar_forward_declarations.h
+++ b/ui/base/cocoa/touch_bar_forward_declarations.h
@@ -10,10 +10,10 @@
#import <Foundation/Foundation.h>
#include "ui/base/ui_base_export.h"
+#pragma clang assume_nonnull begin
#if !defined(MAC_OS_X_VERSION_10_12_1)
-#pragma clang assume_nonnull begin
@class NSTouchBar, NSTouchBarItem;
@protocol NSTouchBarDelegate;