Implement safebrowsing download feedback service, enabled for dev & canary only.

chrome/browser/ui/views/download/download_item_view.h

Index: chrome/browser/ui/views/download/download_item_view.h
diff --git a/chrome/browser/ui/views/download/download_item_view.h b/chrome/browser/ui/views/download/download_item_view.h
index 7af7ca89f0ee61cd2ba1f3b998a3fd3a777ed33c..fa3d53fecc72b2c47a409833f68fa4920abb3d7b 100644
--- a/chrome/browser/ui/views/download/download_item_view.h
+++ b/chrome/browser/ui/views/download/download_item_view.h
@@ -146,6 +146,11 @@ class DownloadItemView : public views::ButtonListener,
 
   void OpenDownload();
 
+  // Submit the downloaded file to the safebrowsing download feedback service.
+  // If true is returned, the DownloadItem and |this| have been deleted.  If
+  // false is returned, nothing has changed.
+  bool BeginDownloadFeedback();
+
   void LoadIcon();
   void LoadIconIfItemPathChanged();