[gnome-builder] plugins/ls: remove session addin

[Christian Hergert <chergert src gnome org>]

commit c10ed6cf147353951b881afa1722bc25d22730fe
Author: Christian Hergert <chergert redhat com>
Date:   Wed Sep 14 16:53:56 2022 -0700

    plugins/ls: remove session addin
    
    This was the only one left, and we'll be doing this differently going
    forward so it's not necessary.

 src/plugins/ls/gbp-ls-session-addin.c | 166 ----------------------------------
 src/plugins/ls/gbp-ls-session-addin.h |  32 -------
 src/plugins/ls/ls-plugin.c            |   4 -
 src/plugins/ls/meson.build            |   1 -
 4 files changed, 203 deletions(-)
---
diff --git a/src/plugins/ls/ls-plugin.c b/src/plugins/ls/ls-plugin.c
index d7fa4c538..1117ed0ba 100644
--- a/src/plugins/ls/ls-plugin.c
+++ b/src/plugins/ls/ls-plugin.c
@@ -25,7 +25,6 @@
 #include <libide-gui.h>
 
 #include "gbp-ls-editor-page-addin.h"
-#include "gbp-ls-session-addin.h"
 #include "gbp-ls-workbench-addin.h"
 
 _IDE_EXTERN void
@@ -34,9 +33,6 @@ _gbp_ls_register_types (PeasObjectModule *module)
   peas_object_module_register_extension_type (module,
                                               IDE_TYPE_EDITOR_PAGE_ADDIN,
                                               GBP_TYPE_LS_EDITOR_PAGE_ADDIN);
-  peas_object_module_register_extension_type (module,
-                                              IDE_TYPE_SESSION_ADDIN,
-                                              GBP_TYPE_LS_SESSION_ADDIN);
   peas_object_module_register_extension_type (module,
                                               IDE_TYPE_WORKBENCH_ADDIN,
                                               GBP_TYPE_LS_WORKBENCH_ADDIN);
diff --git a/src/plugins/ls/meson.build b/src/plugins/ls/meson.build
index d3be22e4a..e74df7ebe 100644
--- a/src/plugins/ls/meson.build
+++ b/src/plugins/ls/meson.build
@@ -2,7 +2,6 @@ plugins_sources += files([
   'gbp-ls-model.c',
   'gbp-ls-page.c',
   'gbp-ls-editor-page-addin.c',
-  'gbp-ls-session-addin.c',
   'gbp-ls-workbench-addin.c',
   'gbp-ls-tree-view.c',
   'ls-plugin.c',