[gnome-online-accounts] Revert "providerfactory: add abstract class to create providers ..."

[Debarshi Ray <debarshir src gnome org>]

commit 85c9fcc03ff77572911ab68f3097432f358ae5c6
Author: Debarshi Ray <debarshir gnome org>
Date:   Tue Apr 17 13:34:53 2018 +0200

    Revert "providerfactory: add abstract class to create providers ..."
    
    Provider factories were only used for Telepathy support, and are now
    unused.
    
    This reverts commit faf55197d814d6385904dfb84adf0988efd6c926.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=795322

 src/goabackend/Makefile.am          |    1 -
 src/goabackend/goaproviderfactory.c |  163 -----------------------------------
 src/goabackend/goaproviderfactory.h |   97 ---------------------
 3 files changed, 0 insertions(+), 261 deletions(-)
---
diff --git a/src/goabackend/Makefile.am b/src/goabackend/Makefile.am
index 2c9e5cc..ed04d0f 100644
--- a/src/goabackend/Makefile.am
+++ b/src/goabackend/Makefile.am
@@ -73,7 +73,6 @@ libgoa_backend_1_0_la_SOURCES =                                               \
        goaewsclient.h                  goaewsclient.c                  \
        goahttpclient.h                 goahttpclient.c                 \
        goaprovider-priv.h              goaprovider.c                   \
-       goaproviderfactory.h            goaproviderfactory.c            \
        goamailauth.h                   goamailauth.c                   \
        goaimapauthlogin.h              goaimapauthlogin.c              \
        goarestproxy.h                  goarestproxy.c                  \