Move download shelf from per-tab to per-window

chrome/browser/browser_window.h

Index: chrome/browser/browser_window.h
===================================================================
--- chrome/browser/browser_window.h	(revision 17483)
+++ chrome/browser/browser_window.h	(working copy)
@@ -10,6 +10,8 @@
 class Browser;
 class BrowserList;
 class BrowserWindowTesting;
+class DownloadItem;
+class DownloadShelf;
 class FindBar;
 class GURL;
 class LocationBar;
@@ -143,6 +145,12 @@
   // |already_bookmarked| is true if the url is already bookmarked.
   virtual void ShowBookmarkBubble(const GURL& url, bool already_bookmarked) = 0;
 
+  // Whether or not the shelf view is visible.
+  virtual bool IsDownloadShelfVisible() const = 0;
+
+  // Returns the DownloadShelf.
+  virtual DownloadShelf* GetDownloadShelf() = 0;
+
   // Shows the Report a Bug dialog box.
   virtual void ShowReportBugDialog() = 0;