Fix two warnings surfaced by closure compiler.

chrome/browser/resources/net_internals/log_util.js

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 logutil = (function() {
   /**
    * Creates a new log dump.  |events| is a list of all events, |polledData| is
    * an object containing the results of each poll, |tabData| is an object
    * containing data for individual tabs, and |date| is the time the dump was
    * created, as a formatted string.
@@ skipping 202 matching lines @@
       parsedDump = JSON.parse(logFileContents);
     } catch (error) {
       try {
         // We may have a --log-net-log=blah log dump.  If so, remove the comma
         // after the final good entry, and add the necessary close brackets.
         var end = Math.max(logFileContents.lastIndexOf(',\n'),
                            logFileContents.lastIndexOf(',\r'));
         if (end != -1)
           parsedDump = JSON.parse(logFileContents.substring(0, end) + ']}');
       }
-      catch (error) {
+      catch (error2) {
       }
     }
 
     if (!parsedDump)
       return 'Unable to parse log dump as JSON file.';
     return loadLogDump(parsedDump, fileName);
   }
 
   // Exports.
   return {
     createLogDumpAsync : createLogDumpAsync,
     loadLogFile : loadLogFile
   };
 })();