Make Tracing Service not use outgoing InterfaceProvider, update conventions

mash/browser/browser.h

Index: mash/browser/browser.h
diff --git a/mash/browser/browser.h b/mash/browser/browser.h
index 5a38100d714e10e9f1a0d9f1d7ea9dd0ab88c5dc..4995fce5f8f954518e7d44ee71472689a3ef22fc 100644
--- a/mash/browser/browser.h
+++ b/mash/browser/browser.h
@@ -11,7 +11,7 @@
 #include "mash/public/interfaces/launchable.mojom.h"
 #include "mojo/public/cpp/bindings/binding_set.h"
 #include "services/shell/public/cpp/service.h"
-#include "services/tracing/public/cpp/tracing_impl.h"
+#include "services/tracing/public/cpp/provider.h"
 
 namespace navigation {
 class View;
@@ -56,7 +56,7 @@ class Browser : public shell::Service,
   mojo::BindingSet<mojom::Launchable> bindings_;
   std::vector<views::Widget*> windows_;
 
-  mojo::TracingImpl tracing_;
+  tracing::Provider tracing_;
   std::unique_ptr<views::AuraInit> aura_init_;
   std::unique_ptr<views::WindowManagerConnection> window_manager_connection_;