Make object property symbols pinnable and adjust symbol color in console.

Source/devtools/front_end/inspector.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 1200 matching lines @@
 .console-formatted-node .properties {
     padding-left: 0 !important;
 }
 
 .console-formatted-number,
 .console-formatted-boolean {
     color: rgb(28, 0, 207);
 }
 
 .console-formatted-string,
-.console-formatted-regexp {
+.console-formatted-regexp,
+.console-formatted-symbol {
     color: rgb(196, 26, 22);
     white-space: pre;
     unicode-bidi: -webkit-isolate;
 }
 
 .console-formatted-null,
 .console-formatted-undefined {
     color: rgb(128, 128, 128);
 }
 
@@ skipping 1659 matching lines @@
 }
 
 select.drop-down-menu {
     border: none;
     -webkit-appearance: none;
 }
 
 .viewport-control-gap-element {
     color: transparent;
 }