DevTools: bake generic css files into the concatenated one.

Source/devtools/front_end/common/utilities.js

 /*
  * Copyright (C) 2007 Apple Inc.  All rights reserved.
  * 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 1656 matching lines @@
 var _importedScripts = {};
 
 /**
  * @param {string} url
  * @return {string}
  */
 function loadResource(url)
 {
     var xhr = new XMLHttpRequest();
     xhr.open("GET", url, false);
-    var stack = new Error().stack;
     try {
         xhr.send(null);
     } catch (e) {
-        console.error(url + " -> " + stack);
+        console.error(url + " -> " + new Error().stack);
         throw e;
     }
     return xhr.responseText;
 }
 
 /**
  * This function behavior depends on the "debug_devtools" flag value.
  * - In debug mode it loads scripts synchronously via xhr request.
  * - In release mode every occurrence of "importScript" in the js files
  *   that have been whitelisted in the build system gets replaced with
@@ skipping 74 matching lines @@
             this._outgoingCallback();
     }
 }
 
 /**
  * @param {*} value
  */
 function suppressUnused(value)
 {
 }