Fix download danger prompt buttons/actions.

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

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // A view that implements one download on the Download shelf.
 // Each DownloadItemViewMd contains an application icon, a text label
 // indicating the download's file name, a text label indicating the
 // download's status (such as the number of bytes downloaded so far)
 // and a button for canceling an in progress download, or opening
 // the completed download.
@@ skipping 274 matching lines @@
 
   // The drop down button.
   BarControlButton* dropdown_button_;
 
   // Dangerous mode label.
   views::Label* dangerous_download_label_;
 
   // Whether the dangerous mode label has been sized yet.
   bool dangerous_download_label_sized_;
 
-  // The size of the buttons.  Cached so animation works when hidden.
-  mutable gfx::Size cached_button_size_;
-
   // Whether we are currently disabled as part of opening the downloaded file.
   bool disabled_while_opening_;
 
   // The time at which this view was created.
   base::Time creation_time_;
 
   // The time at which a dangerous download warning was displayed.
   base::Time time_download_warning_shown_;
 
   // The currently running download context menu.
@@ skipping 12 matching lines @@
   scoped_ptr<extensions::ExperienceSamplingEvent> sampling_event_;
 
   // Method factory used to delay reenabling of the item when opening the
   // downloaded file.
   base::WeakPtrFactory<DownloadItemViewMd> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadItemViewMd);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_DOWNLOAD_DOWNLOAD_ITEM_VIEW_MD_H_