Enable "system-ui" generic font family

third_party/WebKit/Source/platform/fonts/mac/FontFamilyMatcherMacTest.mm

 // Copyright 2015 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 "platform/fonts/mac/FontFamilyMatcherMac.h"
 
+#include "platform/FontFamilyNames.h"
+
 #include <AppKit/AppKit.h>
 #include <gtest/gtest.h>
 
 #import "platform/mac/VersionUtilMac.h"
 
 @interface NSString (YosemiteAdditions)
 - (BOOL)containsString:(NSString*)string;
 @end
 
 namespace blink {
 
 void TestSystemFontContainsString(FontWeight desiredWeight,
                                   NSString* substring) {
-  NSFont* font = MatchNSFontFamily(@"BlinkMacSystemFont", 0, desiredWeight, 11);
+  NSFont* font =
+      MatchNSFontFamily(FontFamilyNames::system_ui, 0, desiredWeight, 11);
   EXPECT_TRUE([font.description containsString:substring]);
 }
 
 TEST(FontFamilyMatcherMacTest, YosemiteFontWeights) {
   if (!IsOS10_10())
     return;
 
   TestSystemFontContainsString(FontWeight100, @"-UltraLight");
   TestSystemFontContainsString(FontWeight200, @"-Thin");
   TestSystemFontContainsString(FontWeight300, @"-Light");
   TestSystemFontContainsString(FontWeight400, @"-Regular");
   TestSystemFontContainsString(FontWeight500, @"-Medium");
   TestSystemFontContainsString(FontWeight600, @"-Bold");
   TestSystemFontContainsString(FontWeight700, @"-Bold");
   TestSystemFontContainsString(FontWeight800, @"-Heavy");
   TestSystemFontContainsString(FontWeight900, @"-Heavy");
 }
 
 }  // namespace blink