Fix using theme colors for the download shelf's close button.

chrome/browser/ui/cocoa/download/download_shelf_view_cocoa.h

Index: chrome/browser/ui/cocoa/download/download_shelf_view_cocoa.h
diff --git a/chrome/browser/ui/cocoa/download/download_shelf_view_cocoa.h b/chrome/browser/ui/cocoa/download/download_shelf_view_cocoa.h
index fabf4ad95f6bbef2bc737a65302297b9c587c988..372ad83d63c9a4359acb1cc7656e3dd943855f15 100644
--- a/chrome/browser/ui/cocoa/download/download_shelf_view_cocoa.h
+++ b/chrome/browser/ui/cocoa/download/download_shelf_view_cocoa.h
@@ -9,10 +9,13 @@
 
 #import "chrome/browser/ui/cocoa/animatable_view.h"
 
+@class HoverCloseButton;
+
 // A view that handles any special rendering for the download shelf, painting
 // a gradient and managing a set of DownloadItemViews.
 
 @interface DownloadShelfView : AnimatableView {
+  IBOutlet HoverCloseButton* closeButton_;
 }
 @end