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

services/service_manager/tests/lifecycle/parent.cc

Index: services/service_manager/tests/lifecycle/parent.cc
diff --git a/services/service_manager/tests/lifecycle/parent.cc b/services/service_manager/tests/lifecycle/parent.cc
index 4c656eced06adbb7e5c3a2c43551722db9a3cb8a..3659159bd3e1a7caca6874effc573e9b055a6afe 100644
--- a/services/service_manager/tests/lifecycle/parent.cc
+++ b/services/service_manager/tests/lifecycle/parent.cc
@@ -36,6 +36,10 @@
 
  private:
   // Service:
+  void OnStart(service_manager::ServiceContext* context) override {
+    context_ = context;
+  }
+
   bool OnConnect(const service_manager::ServiceInfo& remote_info,
                  service_manager::InterfaceRegistry* registry) override {
     registry->AddInterface<service_manager::test::mojom::Parent>(this);
@@ -51,7 +55,7 @@
   // service_manager::test::mojom::Parent:
   void ConnectToChild(const ConnectToChildCallback& callback) override {
     child_connection_ =
-        context()->connector()->Connect("service:lifecycle_unittest_app");
+        context_->connector()->Connect("service:lifecycle_unittest_app");
     service_manager::test::mojom::LifecycleControlPtr lifecycle;
     child_connection_->GetInterface(&lifecycle);
     {
@@ -67,6 +71,7 @@
     base::MessageLoop::current()->QuitWhenIdle();
   }
 
+  service_manager::ServiceContext* context_ = nullptr;
   std::unique_ptr<service_manager::Connection> child_connection_;
   mojo::BindingSet<service_manager::test::mojom::Parent> parent_bindings_;