DevTools: move search in styles out of experimental. It proved to be stable.

Source/devtools/front_end/elementsPanel.css

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2009 Anthony Ricaud <rik@webkit.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 591 matching lines @@
     flex: 1;
     overflow-y: auto;
     position: relative;
 }
 
 .sidebar-pane.composite .metrics-and-computed .sidebar-pane-toolbar,
 .sidebar-pane.composite .metrics-and-styles .sidebar-pane-toolbar {
     position: absolute;
 }
 
-input.filter-box {
-    outline: none !important;
+.sidebar-pane-filter-box {
+    display: flex;
+    border-top: 1px solid rgb(191, 191, 191);
+    flex-basis: 19px;
 }
 
-.sidebar-pane .filter-box-container > .filter-box {
-    margin: 1px 1px 1px 2px;
+.sidebar-pane-filter-box > input {
+    outline: none !important;
+    border: none;
+    width: 100%;
+    margin: 0 4px;
+    background: transparent;
+}
+
+.styles-filter-engaged {
+    background-color: rgba(255, 255, 0, 0.5);
 }
 
 .sidebar-pane.composite .metrics-and-computed .sidebar-pane-toolbar {
     margin-top: 4px;
     margin-bottom: -4px;
     position: relative;
 }
 
 .sidebar-pane.composite .platform-fonts .body {
     padding: 1ex;
@@ skipping 90 matching lines @@
 
 .styles-clipboard-only {
     display: inline-block;
     width: 0;
     opacity: 0;
 }
 
 li.child-editing .styles-clipboard-only {
     display: none;
 }