[evolution] Revert "[EMailBackend] Provide cancellable and show in UI prepare for a quit"

[Milan Crha <mcrha src gnome org>]

commit f5b585cde4ae5e134e51c1d48ae92e6f8f8d71c2
Author: Milan Crha <mcrha redhat com>
Date:   Fri Nov 7 12:40:18 2014 +0100

    Revert "[EMailBackend] Provide cancellable and show in UI prepare for a quit"
    
    This reverts commit 7c918831a8aac463ffe3cdd7e39b36ad09eec34a.
    
    It turned out that the Evolution won't quit when the quit was initiated
    with a "busy" EShellBackend. In that case the EShellBackend itself
    references the activity and lets it alive until the activity is completed.
    The problem is that the activity is completed only after it is freed,
    thus there happens a circular dependency on the reference count of
    that activity.

 mail/e-mail-backend.c |    6 ------
 1 files changed, 0 insertions(+), 6 deletions(-)
---
diff --git a/mail/e-mail-backend.c b/mail/e-mail-backend.c
index 8e8c11b..d3113ba 100644
--- a/mail/e-mail-backend.c
+++ b/mail/e-mail-backend.c
@@ -396,14 +396,8 @@ mail_backend_prepare_for_quit_cb (EShell *shell,
                   camel_operation_cancel_all() had been called, but we want
                   it alive for the following operations, thus reset it. */
                g_cancellable_reset (cancellable);
-       } else {
-               cancellable = camel_operation_new ();
-               e_activity_set_cancellable (activity, cancellable);
-               g_object_unref (cancellable);
        }
 
-       e_shell_backend_add_activity (E_SHELL_BACKEND (backend), activity);
-
        list = camel_session_list_services (CAMEL_SESSION (session));
 
        if (delete_junk) {