Added support for multiple urls in the component updater.

chrome/browser/component_updater/crx_downloader.h

Index: chrome/browser/component_updater/crx_downloader.h
diff --git a/chrome/browser/component_updater/crx_downloader.h b/chrome/browser/component_updater/crx_downloader.h
index e0facd469b42911ca00dff6b294445341a9935a9..029f38006281af6bbf62ec4fcf9ed2cc0dd7c4c5 100644
--- a/chrome/browser/component_updater/crx_downloader.h
+++ b/chrome/browser/component_updater/crx_downloader.h
@@ -82,11 +82,11 @@ class CrxDownloader {
   virtual ~CrxDownloader();
 
   // Starts the download. One instance of the class handles one download only.
-  // Returns true if success or false in case of errors. One instance of
-  // CrxDownloader can only be started once, otherwise the behavior is
-  // undefined.
-  bool StartDownloadFromUrl(const GURL& url);
-  bool StartDownload(const std::vector<GURL>& urls);
+  // One instance of CrxDownloader can only be started once, otherwise the
+  // behavior is undefined. The callback gets invoked if the download can't
+  // be started.
+  void StartDownloadFromUrl(const GURL& url);
+  void StartDownload(const std::vector<GURL>& urls);
 
   const std::vector<DownloadMetrics> download_metrics() const;