Revert of Service Manager: Remove ServiceContext* arg from Service::OnStart()

mash/browser/browser.h

Index: mash/browser/browser.h
diff --git a/mash/browser/browser.h b/mash/browser/browser.h
index 2428b47af72fe693481224575711d75ff6ff76e7..f9fc353531d2d3eb1490f20a6db72cc795324f76 100644
--- a/mash/browser/browser.h
+++ b/mash/browser/browser.h
@@ -16,6 +16,10 @@
 
 namespace navigation {
 class View;
+}
+
+namespace service_manager {
+class ServiceContext;
 }
 
 namespace views {
@@ -44,7 +48,7 @@
 
  private:
   // service_manager::Service:
-  void OnStart() override;
+  void OnStart(service_manager::ServiceContext* context) override;
   bool OnConnect(const service_manager::ServiceInfo& remote_info,
                  service_manager::InterfaceRegistry* registry) override;
 
@@ -54,6 +58,8 @@
   // service_manager::InterfaceFactory<mojom::Launchable>:
   void Create(const service_manager::Identity& remote_identity,
               mojom::LaunchableRequest request) override;
+
+  service_manager::ServiceContext* context_ = nullptr;
 
   mojo::BindingSet<mojom::Launchable> bindings_;
   std::vector<views::Widget*> windows_;