[telemetry] Add newlines to the end of all files that are missing it.

tools/telemetry/telemetry/timeline/trace_event_importer_unittest.py

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import json
 import unittest
 
 import telemetry.timeline.counter as tracing_counter
 import telemetry.timeline.model as timeline_model
 from telemetry.timeline import trace_data as trace_data_module
@@ skipping 1000 matching lines @@
       {'name': 'a2', 'cat': 'foo', 'id': 70, 'pid': 52, 'tid': 53, 'ts': 550,
        'ph': 's', 'args': {}},
       {'name': 'b', 'cat': 'foo', 'id': 73, 'pid': 52, 'tid': 53, 'ts': 570,
        'ph': 'f', 'args': {}},
       {'name': 'a', 'cat': 'foo', 'id': 72, 'pid': 52, 'tid': 53, 'ts': 560,
        'ph': 't', 'args': {}},
     ]
 
     trace_data = trace_data_module.TraceData(events)
     m = timeline_model.TimelineModel(trace_data)
-    self.assertEqual(0, len(m.flow_events))
+    self.assertEqual(0, len(m.flow_events))