Make Service own ServiceContext.

content/common/mojo/mojo_shell_connection_impl.cc

Index: content/common/mojo/mojo_shell_connection_impl.cc
diff --git a/content/common/mojo/mojo_shell_connection_impl.cc b/content/common/mojo/mojo_shell_connection_impl.cc
index fe14742c75a68b53a664d234bf81ecbc0e257f1c..1295ab60cc5d0889f9d4d35b0bdee2a10795d92d 100644
--- a/content/common/mojo/mojo_shell_connection_impl.cc
+++ b/content/common/mojo/mojo_shell_connection_impl.cc
@@ -150,9 +150,7 @@ class MojoShellConnectionImpl::IOThreadContext
   /////////////////////////////////////////////////////////////////////////////
   // shell::Service implementation
 
-  void OnStart(shell::Connector* connector,
-               const shell::Identity& identity,
-               uint32_t id) override {
+  void OnStart(const shell::Identity& identity) override {
     DCHECK(io_thread_checker_.CalledOnValidThread());
     DCHECK(!initialize_handler_.is_null());