Get rid of KeepAlive. Quit shell when all urls run directly by Context are closed.

mojo/application_manager/application_manager.h

Index: mojo/application_manager/application_manager.h
diff --git a/mojo/application_manager/application_manager.h b/mojo/application_manager/application_manager.h
index bb58c1a8553d7cc87d7488cef11f1a7306336d74..01f31634e6362b8e1371b32d618411a1ec9c9f9f 100644
--- a/mojo/application_manager/application_manager.h
+++ b/mojo/application_manager/application_manager.h
@@ -20,6 +20,11 @@ namespace mojo {
 
 class MOJO_APPLICATION_MANAGER_EXPORT ApplicationManager {
  public:
+  class Delegate {
+   public:
+    virtual void OnServiceError(const GURL& url) = 0;
+  };
+
   // API for testing.
   class MOJO_APPLICATION_MANAGER_EXPORT TestAPI {
    public:
@@ -70,6 +75,8 @@ class MOJO_APPLICATION_MANAGER_EXPORT ApplicationManager {
       const GURL& application_url,
       const std::string& interface_name);
 
+  void set_delegate(Delegate* delegate) { delegate_ = delegate; }
+
   // Sets the default Loader to be used if not overridden by SetLoaderForURL()
   // or SetLoaderForScheme().
   void set_default_loader(scoped_ptr<ApplicationLoader> loader) {
@@ -122,6 +129,7 @@ class MOJO_APPLICATION_MANAGER_EXPORT ApplicationManager {
   // Removes a ShellImpl when it encounters an error.
   void OnShellImplError(ShellImpl* shell_impl);
 
+  Delegate* delegate_;
   // Loader management.
   URLToLoaderMap url_to_loader_;
   SchemeToLoaderMap scheme_to_loader_;