DevTools: align call stack rendering with the rest of the panels.

Source/devtools/front_end/sources/CallStackSidebarPane.js

 /*
  * Copyright (C) 2008 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 386 matching lines @@
     this._callFrame = callFrame;
     this._asyncPlacard = asyncPlacard;
 }
 
 WebInspector.CallStackSidebarPane.Placard.prototype = {
     /**
      * @param {!WebInspector.UILocation} uiLocation
      */
     _update: function(uiLocation)
     {
-        this.subtitle = uiLocation.linkText().trimMiddle(100);
+        this.subtitle = uiLocation.linkText().trimMiddle(30);
     },
 
     __proto__: WebInspector.Placard.prototype
 }