Refactor Histogram relationship diagnostics.

tracing/trace_viewer.gypi

Index: tracing/trace_viewer.gypi
diff --git a/tracing/trace_viewer.gypi b/tracing/trace_viewer.gypi
index 192d7d97a45ef7df0f17e99d76f2a5c04cc6da25..0afa2b9bf774bb4c8fa59828afb33c6b6ad608c6 100644
--- a/tracing/trace_viewer.gypi
+++ b/tracing/trace_viewer.gypi
@@ -528,7 +528,6 @@
       'tracing/ui/tracks/x_axis_track.html',
       'tracing/ui/view_specific_brushing_state.html',
       'tracing/value/csv_builder.html',
-      'tracing/value/diagnostics/add_related_names.html',
       'tracing/value/diagnostics/all_diagnostics.html',
       'tracing/value/diagnostics/breakdown.html',
       'tracing/value/diagnostics/collected_related_event_set.html',
@@ -539,10 +538,8 @@
       '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/related_event_set.html',
-      'tracing/value/diagnostics/related_histogram_breakdown.html',
-      'tracing/value/diagnostics/related_histogram_map.html',
+      'tracing/value/diagnostics/related_name_map.html',
       'tracing/value/diagnostics/reserved_names.html',
       'tracing/value/diagnostics/scalar.html',
       'tracing/value/diagnostics/tag_map.html',
@@ -569,7 +566,6 @@
       'tracing/value/ui/histogram_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/scalar_context_controller.html',
       'tracing/value/ui/scalar_diagnostic_span.html',
       'tracing/value/ui/scalar_map_table.html',