[gegl] operation-source: Remove redundant virtual method implementation

[Debarshi Ray <debarshir src gnome org>]

commit a08a937c8d1991e9d0f3b6dd7e92a7f2c71332c7
Author: Debarshi Ray <debarshir gnome org>
Date:   Mon Dec 18 19:42:50 2017 +0100

    operation-source: Remove redundant virtual method implementation
    
    By default, when there is no implementation of the get_cached_region
    virtual method, gegl_operation_get_cached_region will return the
    specified output ROI. Therefore, there is no need to provide an
    implementation that does the same.

 gegl/operation/gegl-operation-source.c |   10 ----------
 1 files changed, 0 insertions(+), 10 deletions(-)
---
diff --git a/gegl/operation/gegl-operation-source.c b/gegl/operation/gegl-operation-source.c
index eb89a8e..62470df 100644
--- a/gegl/operation/gegl-operation-source.c
+++ b/gegl/operation/gegl-operation-source.c
@@ -42,8 +42,6 @@ static GeglRectangle get_bounding_box          (GeglOperation        *self);
 static GeglRectangle get_required_for_output   (GeglOperation        *operation,
                                                  const gchar         *input_pad,
                                                  const GeglRectangle *roi);
-static GeglRectangle  get_cached_region        (GeglOperation       *operation,
-                                                 const GeglRectangle *roi);
 
 
 static void
@@ -53,7 +51,6 @@ gegl_operation_source_class_init (GeglOperationSourceClass * klass)
 
   operation_class->process = gegl_operation_source_process;
   operation_class->attach  = attach;
-  operation_class->get_cached_region = get_cached_region;
 
   operation_class->get_bounding_box  = get_bounding_box;
   operation_class->get_required_for_output = get_required_for_output;
@@ -207,10 +204,3 @@ get_required_for_output (GeglOperation        *operation,
 {
   return *roi;
 }
-
-static GeglRectangle
-get_cached_region (GeglOperation       *operation,
-                   const GeglRectangle *roi)
-{
-  return *roi;
-}