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

services/service_manager/tests/service_manager/target.cc

Index: services/service_manager/tests/service_manager/target.cc
diff --git a/services/service_manager/tests/service_manager/target.cc b/services/service_manager/tests/service_manager/target.cc
index 4e04b55dcdf4d66c45a675079c58a45d4e0f878a..204d10ea937fd6246a1dfd504415cf3ef807a6b2 100644
--- a/services/service_manager/tests/service_manager/target.cc
+++ b/services/service_manager/tests/service_manager/target.cc
@@ -25,11 +25,11 @@
 
  private:
   // service_manager::Service:
-  void OnStart() override {
+  void OnStart(service_manager::ServiceContext* context) override {
     CreateInstanceTestPtr service;
-    context()->connector()->ConnectToInterface(
+    context->connector()->ConnectToInterface(
         "service:service_manager_unittest", &service);
-    service->SetTargetIdentity(context()->identity());
+    service->SetTargetIdentity(context->identity());
   }
 
   bool OnConnect(const service_manager::ServiceInfo& remote_info,