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

chrome/browser/renderer_preferences_util.cc

Index: chrome/browser/renderer_preferences_util.cc
diff --git a/chrome/browser/renderer_preferences_util.cc b/chrome/browser/renderer_preferences_util.cc
index aa4f1c212d2f7e9270239b3d553ad439e1af4a1d..95f7aa67d14aad1f77aa326381c6965dece9e1e9 100644
--- a/chrome/browser/renderer_preferences_util.cc
+++ b/chrome/browser/renderer_preferences_util.cc
@@ -18,6 +18,10 @@
 #include "content/public/common/webrtc_ip_handling_policy.h"
 #include "third_party/skia/include/core/SkColor.h"
 
+#if defined(OS_LINUX)
+#include "ui/base/resource/resource_bundle.h"
+#endif
+
 #if defined(OS_LINUX) || defined(OS_ANDROID)
 #include "ui/gfx/font_render_params.h"
 #endif
@@ -165,6 +169,11 @@ void UpdateFromSystemSettings(content::RendererPreferences* prefs,
   prefs->subpixel_rendering = params.subpixel_rendering;
 #endif
 
+#if defined(OS_LINUX)
+  prefs->system_font_family_name = ui::ResourceBundle::GetSharedInstance()
+      .GetFontWithDelta(0).GetFontName();
+#endif
+
 #if !defined(OS_MACOSX)
   prefs->plugin_fullscreen_allowed =
       pref_service->GetBoolean(prefs::kFullscreenAllowed);