DevTools: fix exception in anchor icon decoration

third_party/WebKit/Source/devtools/front_end/components/Linkifier.js

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 308 matching lines @@
 
   /**
    * @param {!Element} anchor
    */
   static _updateLinkDecorations(anchor) {
     var info = Components.Linkifier._linkInfo(anchor);
     if (!info || !info.enableDecorator)
       return;
     if (!Components.Linkifier._decorator || !info.uiLocation)
       return;
-    if (info.icon)
+    if (info.icon && info.icon.parentElement)

[dgozman, 2016/12/09 21:41:48]

=== anchor ?

[lushnikov, 2016/12/10 00:58:45]

I'd keep this as-is; icon should always be either attached to the anchor, or
detached - otherwise we're hiding a programming error!

       anchor.removeChild(info.icon);
     var icon = Components.Linkifier._decorator.linkIcon(info.uiLocation.uiSourceCode);
     if (icon) {
       icon.style.setProperty('margin-right', '2px');
       anchor.insertBefore(icon, anchor.firstChild);
     }
     info.icon = icon;
   }
 
   /**
@@ skipping 431 matching lines @@
     contextMenu.appendSeparator();
     contextMenu.appendItem(Common.UIString('Save'), save.bind(null, false));
 
     if (contentProvider instanceof Workspace.UISourceCode) {
       var uiSourceCode = /** @type {!Workspace.UISourceCode} */ (contentProvider);
       if (!uiSourceCode.project().canSetFileContent())
         contextMenu.appendItem(Common.UIString.capitalize('Save ^as...'), save.bind(null, true));
     }
   }
 };