Set the font family for the "system-ui" generic font family on Linux

content/renderer/render_view_linux.cc

Index: content/renderer/render_view_linux.cc
diff --git a/content/renderer/render_view_linux.cc b/content/renderer/render_view_linux.cc
index 490f7b4065e0d2f846e85cd9003a753b814c3760..549f6bc82cf6144af6b2021f9a2f94b656e689e6 100644
--- a/content/renderer/render_view_linux.cc
+++ b/content/renderer/render_view_linux.cc
@@ -69,6 +69,9 @@ void RenderViewImpl::UpdateFontRenderingFromRendererPrefs() {
       prefs.default_font_size <= kMaxDefaultFontSize) {
     WebFontRendering::setDefaultFontSize(prefs.default_font_size);
   }
+#if !defined(OS_ANDROID)
+  WebFontRendering::setSystemFontFamily(prefs.system_font_family_name.c_str());
+#endif
 }
 
 }  // namespace content