Mountain Lion: use the system download progress.

chrome/browser/download/download_status_updater.h

Index: chrome/browser/download/download_status_updater.h
diff --git a/chrome/browser/download/download_status_updater.h b/chrome/browser/download/download_status_updater.h
index 162ec1beb5c114cf5a7c325c7c5c5b1cdcbd3dc2..8b606b08995a7b6302d377876a59822e9986da2c 100644
--- a/chrome/browser/download/download_status_updater.h
+++ b/chrome/browser/download/download_status_updater.h
@@ -48,6 +48,15 @@ class DownloadStatusUpdater
   // Update the internal state tracking an item.
   void UpdateItem(content::DownloadItem* download);
 
+  // Updates the platform-specific progress for individual items. Virtual to be
+  // overridable for testing.
+  virtual void UpdateDownloadProgressForItemStarted(
+      content::DownloadItem* download);
+  virtual void UpdateDownloadProgressForItemProgressed(
+      content::DownloadItem* download);
+  virtual void UpdateDownloadProgressForItemCompleted(
+      content::DownloadItem* download);
+
   std::set<content::DownloadManager*> managers_;
   std::set<content::DownloadItem*> items_;