Remove RelatedHistogramSet.

tracing/tracing/value/histogram_set.py

 # Copyright 2017 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 tracing.value import histogram as histogram_module
 from tracing.value.diagnostics import all_diagnostics
 from tracing.value.diagnostics import diagnostic
 from tracing.value.diagnostics import diagnostic_ref
 
 class HistogramSet(object):
@@ skipping 36 matching lines @@
   def LookupHistogram(self, guid):
     return self._histograms_by_guid.get(guid)
 
   def LookupDiagnostic(self, guid):
     return self._shared_diagnostics_by_guid.get(guid)
 
   def ResolveRelatedHistograms(self):
     histograms = self
     def HandleDiagnosticMap(dm):
       for diag in dm.itervalues():
-        if isinstance(
-            diag, (histogram_module.RelatedHistogramSet,
-                   histogram_module.RelatedHistogramMap)):
+        if isinstance(diag, histogram_module.RelatedHistogramMap):
           diag.Resolve(histograms)
 
     for hist in self:
       hist.diagnostics.ResolveSharedDiagnostics(self)
       HandleDiagnosticMap(hist.diagnostics)
       for dm in hist.nan_diagnostic_maps:
         HandleDiagnosticMap(dm)
       for hbin in hist.bins:
         for dm in hbin.diagnostic_maps:
           HandleDiagnosticMap(dm)
@@ skipping 22 matching lines @@
     return dcts
 
   def ReplaceSharedDiagnostic(self, old_guid, new_diagnostic):
     if not isinstance(new_diagnostic, diagnostic_ref.DiagnosticRef):
       self._shared_diagnostics_by_guid[new_diagnostic.guid] = new_diagnostic
 
     for hist in self:
       for name, diag in hist.diagnostics.iteritems():
         if diag.has_guid and diag.guid == old_guid:
           hist.diagnostics[name] = new_diagnostic