Replace internal uses of BlinkMacSystemFont on Mac with system-ui

third_party/WebKit/Source/platform/mac/ThemeMac.mm

 /*
  * Copyright (C) 2008, 2010, 2011, 2012 Apple Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 375 matching lines @@
                                       float zoomFactor) const {
   switch (part) {
     case PushButtonPart: {
       FontDescription result;
       result.setIsAbsoluteSize(true);
       result.setGenericFamily(FontDescription::SerifFamily);
 
       NSFont* nsFont = [NSFont
           systemFontOfSize:[NSFont systemFontSizeForControlSize:
                                        controlSizeForFont(fontDescription)]];
-      result.firstFamily().setFamily(@"BlinkMacSystemFont");
+      result.firstFamily().setFamily(FontFamilyNames::system_ui);
       result.setComputedSize([nsFont pointSize] * zoomFactor);
       result.setSpecifiedSize([nsFont pointSize] * zoomFactor);
       return result;
     }
     default:
       return Theme::controlFont(part, fontDescription, zoomFactor);
   }
 }
 
 LengthSize ThemeMac::controlSize(ControlPart part,
@@ skipping 134 matching lines @@
       zoomedRect =
           inflateRect(zoomedRect, zoomedSize, stepperMargin, zoomFactor);
       break;
     }
     default:
       break;
   }
   END_BLOCK_OBJC_EXCEPTIONS
 }
 }