Eliminate mojo::Shell client lib class

mojo/shell/public/cpp/lib/shell_client.cc

Index: mojo/shell/public/cpp/lib/shell_client.cc
diff --git a/mojo/shell/public/cpp/lib/shell_client.cc b/mojo/shell/public/cpp/lib/shell_client.cc
index 657006888505381b88710a440cb79efe1d2aff5e..0d553f085a79d9e0840a9f0768b283cc86a99f4f 100644
--- a/mojo/shell/public/cpp/lib/shell_client.cc
+++ b/mojo/shell/public/cpp/lib/shell_client.cc
@@ -9,7 +9,7 @@ namespace mojo {
 ShellClient::ShellClient() {}
 ShellClient::~ShellClient() {}
 
-void ShellClient::Initialize(Shell* app, const std::string& url,
+void ShellClient::Initialize(Connector* connector, const std::string& url,
                              uint32_t id, uint32_t user_id) {
 }
 
@@ -21,6 +21,4 @@ bool ShellClient::ShellConnectionLost() {
   return true;
 }
 
-void ShellClient::Quit() {}
-
 }  // namespace mojo