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

mojo/shell/public/cpp/shell.h

Index: mojo/shell/public/cpp/shell.h
diff --git a/mojo/shell/public/cpp/shell.h b/mojo/shell/public/cpp/shell.h
index cb7aec545219668fe772505622eb4b8448bb6526..cade46a1af085cba8b3f7782362954db09cbb60c 100644
--- a/mojo/shell/public/cpp/shell.h
+++ b/mojo/shell/public/cpp/shell.h
@@ -57,8 +57,8 @@ class Shell {
   // other threads.
   virtual scoped_ptr<Connector> CloneConnector() const = 0;
 
-  // Initiate shutdown of this application. This may involve a round trip to the
-  // Shell to ensure there are no inbound service requests.
+  // Quits the message loop run by the ApplicationRunner, which causes this
+  // object to be destructed and the application to quit.
   virtual void Quit() = 0;
 
   // Create an object that can be used to refcount the lifetime of the