[DevTools] Group options in network presets select.

Source/devtools/front_end/ui/toolbar.css

 /*
  * Copyright (c) 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.
  */
 
 :host {
     flex: none;
     padding: 0 2px;
 }
@@ skipping 413 matching lines @@
 }
 
 .histogram-toolbar-item .glyph {
     -webkit-mask-position: -160px -48px;
 }
 
 .flame-chart-toolbar-item .glyph {
     -webkit-mask-position: -192px -48px;
 }
 
+.filter-small-toolbar-item > .glyph {
+    -webkit-mask-position: -256px -96px;
+}
+
 .filter-toolbar-item > .glyph {
     -webkit-mask-position: -32px -48px;
 }
 
 .filter-toolbar-item.toggled-shown .glyph {
     background-color: rgb(66, 129, 235) !important;
 }
 
 .filter-toolbar-item.toggled-shown {
     background-color: #f3f3f3;
@@ skipping 73 matching lines @@
 }
 
 .playback-rate-button.toggled-on > .toolbar-button-text {
     color: rgb(66, 129, 235);
 }
 
 button.playback-rate-button {
     width: auto;
     margin-right: 10px;
 }