[mutter] cogl: Remove unused COGL_FEATURE_ID_ONSCREEN_MULTIPLE

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 34a38827b79318dae67b857de70becfb69bdcf83
Author: Adam Jackson <ajax redhat com>
Date:   Thu Oct 17 19:50:20 2019 -0400

    cogl: Remove unused COGL_FEATURE_ID_ONSCREEN_MULTIPLE
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/866

 cogl/cogl/cogl-context.h               | 3 ---
 cogl/cogl/winsys/cogl-winsys-egl-x11.c | 2 --
 cogl/cogl/winsys/cogl-winsys-glx.c     | 3 ---
 3 files changed, 8 deletions(-)
---
diff --git a/cogl/cogl/cogl-context.h b/cogl/cogl/cogl-context.h
index f4fd7be57..6a3fc8ae9 100644
--- a/cogl/cogl/cogl-context.h
+++ b/cogl/cogl/cogl-context.h
@@ -179,8 +179,6 @@ cogl_is_context (void *object);
  *    texture.
  * @COGL_FEATURE_ID_OFFSCREEN_MULTISAMPLE: Multisample support for
  *    offscreen framebuffers
- * @COGL_FEATURE_ID_ONSCREEN_MULTIPLE: Multiple onscreen framebuffers
- *    supported.
  * @COGL_FEATURE_ID_UNSIGNED_INT_INDICES: Set if
  *     %COGL_INDICES_TYPE_UNSIGNED_INT is supported in
  *     cogl_indices_new().
@@ -206,7 +204,6 @@ cogl_is_context (void *object);
 typedef enum _CoglFeatureID
 {
   COGL_FEATURE_ID_OFFSCREEN_MULTISAMPLE,
-  COGL_FEATURE_ID_ONSCREEN_MULTIPLE,
   COGL_FEATURE_ID_UNSIGNED_INT_INDICES,
   COGL_FEATURE_ID_MAP_BUFFER_FOR_READ,
   COGL_FEATURE_ID_MAP_BUFFER_FOR_WRITE,
diff --git a/cogl/cogl/winsys/cogl-winsys-egl-x11.c b/cogl/cogl/winsys/cogl-winsys-egl-x11.c
index 194fc15a8..dafe7a6a7 100644
--- a/cogl/cogl/winsys/cogl-winsys-egl-x11.c
+++ b/cogl/cogl/winsys/cogl-winsys-egl-x11.c
@@ -387,8 +387,6 @@ _cogl_winsys_egl_context_init (CoglContext *context,
                                  event_filter_cb,
                                  context);
 
-  COGL_FLAGS_SET (context->features,
-                  COGL_FEATURE_ID_ONSCREEN_MULTIPLE, TRUE);
   COGL_FLAGS_SET (context->winsys_features,
                   COGL_WINSYS_FEATURE_MULTIPLE_ONSCREEN,
                   TRUE);
diff --git a/cogl/cogl/winsys/cogl-winsys-glx.c b/cogl/cogl/winsys/cogl-winsys-glx.c
index b36d3ef57..6b8239db1 100644
--- a/cogl/cogl/winsys/cogl-winsys-glx.c
+++ b/cogl/cogl/winsys/cogl-winsys-glx.c
@@ -832,9 +832,6 @@ update_winsys_features (CoglContext *context, GError **error)
 
   context->feature_flags |= glx_renderer->legacy_feature_flags;
 
-  COGL_FLAGS_SET (context->features,
-                  COGL_FEATURE_ID_ONSCREEN_MULTIPLE, TRUE);
-
   if (glx_renderer->glXCopySubBuffer || context->glBlitFramebuffer)
     {
       CoglGpuInfo *info = &context->gpu;