DevTools: Fix closure compiler error.

Source/core/inspector/InjectedScriptSource.js

 /*
  * Copyright (C) 2007 Apple Inc.  All rights reserved.
  * Copyright (C) 2013 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 955 matching lines @@
 
     /**
      * @param {*} obj
      * @return {string?}
      */
     _describe: function(obj)
     {
         if (this.isPrimitiveValue(obj))
             return null;
 
-        // Type is object, get subtype.
+        var type = typeof obj;
         var subtype = this._subtype(obj);
 
         if (subtype === "regexp")
             return toString(obj);
 
         if (subtype === "date")
             return toString(obj);
 
         if (subtype === "node") {
             var description = obj.nodeName.toLowerCase();
@@ skipping 11 matching lines @@
         }
 
         var className = InjectedScriptHost.internalConstructorName(obj);
         if (subtype === "array") {
             if (typeof obj.length === "number")
                 className += "[" + obj.length + "]";
             return className;
         }
 
         // NodeList in JSC is a function, check for array prior to this.
-        if (typeof obj === "function")
+        if (type === "function")
             return toString(obj);
 
-        if (typeof obj === "symbol") {
+        if (type === "symbol") {
             try {
                 return Symbol.prototype.toString.call(obj) || "Symbol";
             } catch (e) {
                 return "Symbol";
             }
         }
 
         if (className === "Object") {
             // In Chromium DOM wrapper prototypes will have Object as their constructor name,
             // get the real DOM wrapper name from the constructor property.
@@ skipping 607 matching lines @@
      */
     _logEvent: function(event)
     {
         inspectedWindow.console.log(event.type, event);
     }
 }
 
 injectedScript._commandLineAPIImpl = new CommandLineAPIImpl();
 return injectedScript;
 })