Remove RelatedHistogramSet.

tracing/trace_viewer.gypi

 # Copyright (c) 2015 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.
 
 {
   'variables': {
     'tracing_css_files': [
       'tracing/ui/base/list_view.css',
       'tracing/ui/extras/about_tracing/common.css',
       'tracing/ui/extras/chrome/cc/display_item_list_view.css',
@@ skipping 527 matching lines @@
       'tracing/value/diagnostics/diagnostic_ref.html',
       'tracing/value/diagnostics/event_ref.html',
       'tracing/value/diagnostics/generic_set.html',
       'tracing/value/diagnostics/grouping_path.html',
       'tracing/value/diagnostics/histogram_ref.html',
       'tracing/value/diagnostics/merged_buildbot_info.html',
       'tracing/value/diagnostics/merged_telemetry_info.html',
       'tracing/value/diagnostics/related_event_set.html',
       'tracing/value/diagnostics/related_histogram_breakdown.html',
       'tracing/value/diagnostics/related_histogram_map.html',
-      'tracing/value/diagnostics/related_histogram_set.html',
       'tracing/value/diagnostics/reserved_names.html',
       'tracing/value/diagnostics/scalar.html',
       'tracing/value/diagnostics/tag_map.html',
       'tracing/value/diagnostics/telemetry_info.html',
       'tracing/value/diagnostics/unmergeable_diagnostic_set.html',
       'tracing/value/histogram.html',
       'tracing/value/histogram_grouping.html',
       'tracing/value/histogram_parameter_collector.html',
       'tracing/value/histogram_set.html',
       'tracing/value/histogram_set_hierarchy.html',
@@ skipping 10 matching lines @@
       'tracing/value/ui/histogram_set_table_name_cell.html',
       'tracing/value/ui/histogram_set_table_row.html',
       'tracing/value/ui/histogram_set_view.html',
       'tracing/value/ui/histogram_set_view_state.html',
       'tracing/value/ui/histogram_span.html',
       'tracing/value/ui/merged_buildbot_info_span.html',
       'tracing/value/ui/merged_telemetry_info_span.html',
       'tracing/value/ui/preferred_display_unit.html',
       'tracing/value/ui/related_event_set_span.html',
       'tracing/value/ui/related_histogram_map_span.html',
-      'tracing/value/ui/related_histogram_set_span.html',
       'tracing/value/ui/scalar_context_controller.html',
       'tracing/value/ui/scalar_diagnostic_span.html',
       'tracing/value/ui/scalar_map_table.html',
       'tracing/value/ui/scalar_span.html',
       'tracing/value/ui/tag_map_span.html',
       'tracing/value/ui/telemetry_info_span.html',
       'tracing/value/ui/unmergeable_diagnostic_set_span.html',
     ],
     'tracing_img_files': [
       'tracing/ui/extras/chrome/cc/images/input-event.png',
       'tracing/ui/extras/chrome/gpu/images/checkerboard.png',
       'tracing/ui/images/chrome-left.png',
       'tracing/ui/images/chrome-mid.png',
       'tracing/ui/images/chrome-right.png',
       'tracing/ui/images/ui-states.png',
     ],
     'tracing_files': [
       '<@(tracing_css_files)',
       '<@(tracing_js_html_files)',
       '<@(tracing_img_files)',
     ],
   }
 }