Move download shelf from per-tab to per-window

chrome/browser/tab_contents/tab_contents_view_gtk.h

Index: chrome/browser/tab_contents/tab_contents_view_gtk.h
===================================================================
--- chrome/browser/tab_contents/tab_contents_view_gtk.h	(revision 17483)
+++ chrome/browser/tab_contents/tab_contents_view_gtk.h	(working copy)
@@ -74,12 +74,9 @@
                                  GtkAllocation* config,
                                  TabContentsViewGtk* view);
 
-  // The native widget for the tab.
-  OwnedWidgetGtk vbox_;
-
   // This container holds the tab's web page views. It is a GtkFixed so that we
   // can control the size of the web pages.
-  GtkWidget* fixed_;
+  OwnedWidgetGtk fixed_;
 
   // The context menu is reset every time we show it, but we keep a pointer to
   // between uses so that it won't go out of scope before we're done with it.