Implement additional UI changes for dangerous download warnings.

chrome/browser/download/download_shelf_context_menu.h

Index: chrome/browser/download/download_shelf_context_menu.h
diff --git a/chrome/browser/download/download_shelf_context_menu.h b/chrome/browser/download/download_shelf_context_menu.h
index 3e7c47dc273c012dad616cee5519cf7c847f567f..7d7d2212e288043ca14c43bd6d7e0414a46275bb 100644
--- a/chrome/browser/download/download_shelf_context_menu.h
+++ b/chrome/browser/download/download_shelf_context_menu.h
@@ -25,6 +25,9 @@ class DownloadShelfContextMenu : public ui::SimpleMenuModel::Delegate {
     ALWAYS_OPEN_TYPE,    // Default this file extension to always open.
     CANCEL,              // Cancel the download.
     TOGGLE_PAUSE,        // Temporarily pause a download.
+    DISCARD,             // Discard the malicious download.
+    KEEP,                // Keep the malicious download.
+    LEARN_MORE,          // Show information about download scanning.
     MENU_LAST
   };
 
@@ -53,11 +56,13 @@ class DownloadShelfContextMenu : public ui::SimpleMenuModel::Delegate {
  private:
   ui::SimpleMenuModel* GetInProgressMenuModel();
   ui::SimpleMenuModel* GetFinishedMenuModel();
+  ui::SimpleMenuModel* GetMaliciousMenuModel();
 
   // We show slightly different menus if the download is in progress vs. if the
   // download has finished.
   scoped_ptr<ui::SimpleMenuModel> in_progress_download_menu_model_;
   scoped_ptr<ui::SimpleMenuModel> finished_download_menu_model_;
+  scoped_ptr<ui::SimpleMenuModel> malicious_download_menu_model_;
 
   // A model to control the cancel behavior.
   BaseDownloadItemModel* download_model_;