Delete the tracing service

components/font_service/font_service_app.h

Index: components/font_service/font_service_app.h
diff --git a/components/font_service/font_service_app.h b/components/font_service/font_service_app.h
index ddad2541748e29ced8e741f20c2d3357ba636863..44528b9d6148a55ace0a29a84c03e2c73d016ac1 100644
--- a/components/font_service/font_service_app.h
+++ b/components/font_service/font_service_app.h
@@ -14,7 +14,6 @@
 #include "services/service_manager/public/cpp/binder_registry.h"
 #include "services/service_manager/public/cpp/interface_factory.h"
 #include "services/service_manager/public/cpp/service.h"
-#include "services/tracing/public/cpp/provider.h"
 #include "skia/ext/skia_utils_base.h"
 
 namespace font_service {
@@ -50,8 +49,6 @@ class FontServiceApp
   service_manager::BinderRegistry registry_;
   mojo::BindingSet<mojom::FontService> bindings_;
 
-  tracing::Provider tracing_;
-
   // We don't want to leak paths to our callers; we thus enumerate the paths of
   // fonts.
   std::vector<SkString> paths_;