Rename ValueSet* to HistogramSet*.

tracing/tracing/metrics/blink/gc_metric_test.html

Index: tracing/tracing/metrics/blink/gc_metric_test.html
diff --git a/tracing/tracing/metrics/blink/gc_metric_test.html b/tracing/tracing/metrics/blink/gc_metric_test.html
index 9a9fb72b342eca9be97301abcc5448f05bec8091..c1d23839c24d2baef7aec17992b3abec1758da0d 100644
--- a/tracing/tracing/metrics/blink/gc_metric_test.html
+++ b/tracing/tracing/metrics/blink/gc_metric_test.html
@@ -9,7 +9,7 @@ found in the LICENSE file.
 <link rel="import" href="/tracing/extras/importer/trace_event_importer.html">
 <link rel="import" href="/tracing/metrics/blink/gc_metric.html">
 <link rel="import" href="/tracing/model/slice_group.html">
-<link rel="import" href="/tracing/value/value_set.html">
+<link rel="import" href="/tracing/value/histogram_set.html">
 
 <script>
 'use strict';
@@ -37,7 +37,7 @@ tr.b.unittest.testSuite(function() {
   }
 
   function run(slices) {
-    var values = new tr.v.ValueSet();
+    var values = new tr.v.HistogramSet();
     var startTime = slices.reduce((acc, slice) => (Math.min(acc, slice.start)));
     var endTime = slices.reduce((acc, slice) => (Math.max(acc, slice.end)));
     var model = createModel(startTime - 1, endTime + 1, slices);
@@ -87,7 +87,7 @@ tr.b.unittest.testSuite(function() {
   });
 
   test('idleTimes', function() {
-    var values = new tr.v.ValueSet();
+    var values = new tr.v.HistogramSet();
     var slices = [
       {
         title: 'SingleThreadIdleTaskRunner::RunTask',
@@ -125,7 +125,7 @@ tr.b.unittest.testSuite(function() {
   });
 
   test('idleTimeOverrun', function() {
-    var values = new tr.v.ValueSet();
+    var values = new tr.v.HistogramSet();
     var slices = [
       {
         title: 'SingleThreadIdleTaskRunner::RunTask',
@@ -163,7 +163,7 @@ tr.b.unittest.testSuite(function() {
   });
 
   test('total', function() {
-    var values = new tr.v.ValueSet();
+    var values = new tr.v.HistogramSet();
     var slices = [
       {
         title: 'BlinkGCMarking', args: {}, start: 100, end: 200,