Revert of Quit the message loop by default in ShellConnectionLost when ApplicationRunner is used

mojo/shell/public/cpp/shell_client.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MOJO_SHELL_PUBLIC_CPP_SHELL_CLIENT_H_
 #define MOJO_SHELL_PUBLIC_CPP_SHELL_CLIENT_H_
 
 #include <stdint.h>
 #include <string>
 
@@ skipping 25 matching lines @@
                           uint32_t id);
 
   // Called when a connection to this client is brokered by the shell. Override
   // to expose services to the remote application. Return true if the connection
   // should succeed. Return false if the connection should be rejected and the
   // underlying pipe closed. The default implementation returns false.
   virtual bool AcceptConnection(Connection* connection);
 
   // Called when ShellConnection's ShellClient binding (i.e. the pipe the
   // Mojo Shell has to talk to us over) is closed. A shell client may use this
-  // as a signal to terminate. Return true from this method to tell the
-  // ShellConnection to run its connection lost closure if it has one, false to
-  // prevent it from being run. The default implementation returns true.
-  // When used in conjunction with ApplicationRunner, returning true here quits
-  // the message loop created by ApplicationRunner, which results in the app
-  // quitting.
-  virtual bool ShellConnectionLost();
+  // as a signal to terminate.
+  virtual void ShellConnectionLost();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ShellClient);
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_SHELL_PUBLIC_CPP_SHELL_CLIENT_H_