[Telemetry + tools/perf] Modify the pylint disable message to use symbolic name

tools/perf/metrics/system_memory.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.
 
 from telemetry.value import scalar
 
 from metrics import memory
 from metrics import Metric
 
 
@@ skipping 20 matching lines @@
   def Stop(self, page, tab):
     """Prepare the results for this page.
 
     The results are the differences between the current system memory stats
     and the values when Start() was called.
     """
     assert self._memory_stats_start, 'Must call Start() first'
     self._memory_stats_end = self._browser.memory_stats
 
   # |trace_name| and |exclude_metrics| args are not in base class Metric.
-  # pylint: disable=W0221
+  # pylint: disable=arguments-differ
   def AddResults(self, tab, results, trace_name=None, exclude_metrics=None):
     """Add results for this page to the results object.
 
     Reports the delta in memory stats between the start stats and the end stats
     (as *_delta metrics). It reports end memory stats in case no matching start
     memory stats exists.
 
     Args:
       trace_name: Trace name to identify the summary results for current page.
       exclude_metrics: List of memory metrics to exclude from results,
@@ skipping 64 matching lines @@
       memory_stats[process_type] = end_process_memory - start_value
     else:
       for metric in end_process_memory:
         end_value = end_process_memory[metric]
         start_value = start_memory_stats[process_type].get(metric, 0)
         if 'Peak' in metric:
           memory_stats[process_type][metric] = end_value
         else:
           memory_stats[process_type][metric] = end_value - start_value
   return memory_stats