DevTools: NetworkRequest: convert connectionId to string

Source/devtools/front_end/network/HAREntry.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 40 matching lines @@
     {
         var entry = {
             startedDateTime: new Date(this._request.startTime * 1000),
             time: this._request.timing ? WebInspector.HAREntry._toMilliseconds(this._request.duration) : 0,
             request: this._buildRequest(),
             response: this._buildResponse(),
             cache: { }, // Not supported yet.
             timings: this._buildTimings()
         };
 
-        if (this._request.connectionId)
-            entry.connection = String(this._request.connectionId);
+        if (this._request.connectionId !== "0")
+            entry.connection = this._request.connectionId;
         var page = this._request.target().networkLog.pageLoadForRequest(this._request);
         if (page)
             entry.pageref = "page_" + page.id;
         return entry;
     },
 
     /**
      * @return {!Object}
      */
     _buildRequest: function()
@@ skipping 357 matching lines @@
             this._writeProgress.done();
             return;
         }
         const chunkSize = 100000;
         var text = this._text.substring(this._bytesWritten, this._bytesWritten + chunkSize);
         this._bytesWritten += text.length;
         stream.write(text, this._writeNextChunk.bind(this));
         this._writeProgress.setWorked(this._bytesWritten);
     }
 }