Fix hangs in Mandoline page cycler on Linux with --enable-multiprocess.

mojo/package_manager/content_handler_connection.h

Index: mojo/package_manager/content_handler_connection.h
diff --git a/mojo/package_manager/content_handler_connection.h b/mojo/package_manager/content_handler_connection.h
index 9bc107970ab905c0e10ac41c470792a28b714b21..bbea355cbe4be413f3777fdf4c7270cc982ac2f4 100644
--- a/mojo/package_manager/content_handler_connection.h
+++ b/mojo/package_manager/content_handler_connection.h
@@ -34,16 +34,20 @@ class ContentHandlerConnection {
                            uint32_t id,
                            const ClosedCallback& connection_closed_callback);
 
+  void StartApplication(InterfaceRequest<Application> request,
+                        URLResponsePtr response);
+
   // Closes the connection and destroys |this| object.
   void CloseConnection();
 
-  ContentHandler* content_handler() { return content_handler_.get(); }
   const shell::Identity& identity() const { return identity_; }
   uint32_t id() const { return id_; }
 
  private:
   ~ContentHandlerConnection();
 
+  void ApplicationDestructed();
+
   ClosedCallback connection_closed_callback_;
   shell::Identity identity_;
 
@@ -51,6 +55,7 @@ class ContentHandlerConnection {
   bool connection_closed_;
   // The id for this content handler.
   const uint32_t id_;
+  int ref_count_;
 
   DISALLOW_COPY_AND_ASSIGN(ContentHandlerConnection);
 };