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 47f26846033865a56124f906566bf3ccb16f2d52..1c64923f3297492efda71f344380dd5459911db5 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();