Eliminate Quit() from Shell, and roll Shell & Connector together.

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

Index: mojo/shell/public/cpp/lib/connector_impl.cc
diff --git a/mojo/shell/public/cpp/lib/connector_impl.cc b/mojo/shell/public/cpp/lib/connector_impl.cc
index 33cc1bf0aaa7b3a486ece064d0eef9a96ae0c7d9..5adf92151849300849d5e8fcb797c7c2ef8cbd8c 100644
--- a/mojo/shell/public/cpp/lib/connector_impl.cc
+++ b/mojo/shell/public/cpp/lib/connector_impl.cc
@@ -16,6 +16,12 @@ Connector::ConnectParams::~ConnectParams() {}
 
 ConnectorImpl::ConnectorImpl(shell::mojom::ConnectorPtrInfo unbound_state)
     : unbound_state_(std::move(unbound_state)) {}
+ConnectorImpl::ConnectorImpl(shell::mojom::ConnectorPtr connector,
+                             const base::Closure& connection_error_closure)
+    : connector_(std::move(connector)) {
+  connector_.set_connection_error_handler(connection_error_closure);
+  thread_checker_.reset(new base::ThreadChecker);
+}
 ConnectorImpl::~ConnectorImpl() {}
 
 scoped_ptr<Connection> ConnectorImpl::Connect(const std::string& url) {