Fix a crashing call to GURL::spec() in downloads_api.cc:DownloadItemToJSON()

chrome/browser/extensions/api/downloads/downloads_api.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/extensions/api/downloads/downloads_api.h"
 
 #include <algorithm>
 #include <cctype>
 #include <iterator>
 #include <set>
@@ skipping 199 matching lines @@
       exploded.day_of_month, exploded.hour, exploded.minute, exploded.second,
       exploded.millisecond);
 }
 
 scoped_ptr<base::DictionaryValue> DownloadItemToJSON(
     DownloadItem* download_item,
     bool incognito) {
   base::DictionaryValue* json = new base::DictionaryValue();
   json->SetBoolean(kExistsKey, !download_item->GetFileExternallyRemoved());
   json->SetInteger(kIdKey, download_item->GetId());
-  json->SetString(kUrlKey, download_item->GetOriginalUrl().spec());
+  const GURL& url = download_item->GetOriginalUrl();
+  json->SetString(kUrlKey, (url.is_valid() ? url.spec() : ""));
   json->SetString(
       kFilenameKey, download_item->GetFullPath().LossyDisplayName());
   json->SetString(kDangerKey, DangerString(download_item->GetDangerType()));
   if (download_item->GetDangerType() !=
       content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS)
     json->SetBoolean(kDangerAcceptedKey,
                      download_item->GetDangerType() ==
                      content::DOWNLOAD_DANGER_TYPE_USER_VALIDATED);
   json->SetString(kStateKey, StateString(download_item->GetState()));
   json->SetBoolean(kPausedKey, download_item->IsPaused());
@@ skipping 1212 matching lines @@
   DownloadsNotificationSource notification_source;
   notification_source.event_name = event_name;
   notification_source.profile = profile_;
   content::Source<DownloadsNotificationSource> content_source(
       &notification_source);
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_EXTENSION_DOWNLOADS_EVENT,
       content_source,
       content::Details<std::string>(&json_args));
 }