Eliminate unused code block.

Should have been eliminated with 517f248.

lib/galaxy/tools/parameters/output_collect.py

@@ -528,17 +528,6 @@ def create_dataset(
 def collect_primary_datasets(tool, output, tool_provided_metadata, job_working_directory, input_ext, input_dbkey="?"):
     app = tool.app
     sa_session = tool.sa_session
-    new_primary_datasets = {}
-    try:
-        galaxy_json_path = os.path.join(job_working_directory, "working", tool.provide_metadata_file)
-        json_file = open(galaxy_json_path, 'r')
-        for line in json_file:
-            line = json.loads(line)
-            if line.get('type') == 'new_primary_dataset':
-                new_primary_datasets[os.path.split(line.get('filename'))[-1]] = line
-    except Exception:
-        # This should not be considered an error or warning condition, this file is optional
-        pass
     # Loop through output file names, looking for generated primary
     # datasets in form specified by discover dataset patterns or in tool provided metadata.
     primary_output_assigned = False