DevTools: NetworkPanel: use optimistic JSON parser for response preview.

Source/devtools/front_end/network/RequestPreviewView.js

 /*
  * Copyright (C) 2011 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 63 matching lines @@
     _createMessageView: function(message)
     {
         return new WebInspector.EmptyView(message);
     },
 
     /**
      * @return {?WebInspector.RequestJSONView}
      */
     _jsonView: function()
     {
-        var parsedJSON = WebInspector.RequestJSONView.parseJSON(this.request.content || "");
+        var request = this.request;
+        var content = request.content;
+        content = request.contentEncoded ? window.atob(content || "") : (content || "");
+        var parsedJSON = WebInspector.RequestJSONView.parseJSON(content);
         return parsedJSON ? new WebInspector.RequestJSONView(this.request, parsedJSON) : null;
     },
 
     /**
      * @return {?WebInspector.RequestHTMLView}
      */
     _htmlErrorPreview: function()
     {
         var whitelist = ["text/html", "text/plain", "application/xhtml+xml"];
         if (whitelist.indexOf(this.request.mimeType) === -1)
@@ skipping 37 matching lines @@
             return this._responseView.sourceView;
 
         if (this.request.type === WebInspector.resourceTypes.Other)
             return this._createEmptyView();
 
         return WebInspector.RequestView.nonSourceViewForRequest(this.request);
     },
 
     __proto__: WebInspector.RequestContentView.prototype
 }