Remove unused method subsection_handler

Removing this particular call to json.dumps was done by removing
the complete method subsection_handler which is no longer
used.  The template edit_subsection.html had already been removed.

TNL-2646 Escape json

cms/djangoapps/contentstore/views/component.py

@@ -74,66 +74,6 @@ def _advanced_component_types():
     return [c_type for c_type in ADVANCED_COMPONENT_TYPES if c_type not in settings.DEPRECATED_ADVANCED_COMPONENT_TYPES]
 
 
-@require_GET
-@login_required
-def subsection_handler(request, usage_key_string):
-    """
-    The restful handler for subsection-specific requests.
-
-    GET
-        html: return html page for editing a subsection
-        json: not currently supported
-    """
-    if 'text/html' in request.META.get('HTTP_ACCEPT', 'text/html'):
-        usage_key = UsageKey.from_string(usage_key_string)
-        try:
-            course, item, lms_link, preview_link = _get_item_in_course(request, usage_key)
-        except ItemNotFoundError:
-            return HttpResponseBadRequest()
-
-        # make sure that location references a 'sequential', otherwise return
-        # BadRequest
-        if item.location.category != 'sequential':
-            return HttpResponseBadRequest()
-
-        parent = get_parent_xblock(item)
-
-        # remove all metadata from the generic dictionary that is presented in a
-        # more normalized UI. We only want to display the XBlocks fields, not
-        # the fields from any mixins that have been added
-        fields = getattr(item, 'unmixed_class', item.__class__).fields
-
-        policy_metadata = dict(
-            (field.name, field.read_from(item))
-            for field
-            in fields.values()
-            if field.name not in ['display_name', 'start', 'due', 'format'] and field.scope == Scope.settings
-        )
-
-        can_view_live = False
-        subsection_units = item.get_children()
-        can_view_live = any([modulestore().has_published_version(unit) for unit in subsection_units])
-
-        return render_to_response(
-            'edit_subsection.html',
-            {
-                'subsection': item,
-                'context_course': course,
-                'new_unit_category': 'vertical',
-                'lms_link': lms_link,
-                'preview_link': preview_link,
-                'course_graders': json.dumps(CourseGradingModel.fetch(item.location.course_key).graders),
-                'parent_item': parent,
-                'locator': item.location,
-                'policy_metadata': policy_metadata,
-                'subsection_units': subsection_units,
-                'can_view_live': can_view_live
-            }
-        )
-    else:
-        return HttpResponseBadRequest("Only supports html requests")
-
-
 def _load_mixed_class(category):
     """
     Load an XBlock by category name, and apply all defined mixins