Convert tabcontentscontainer to use a vbox instead of a fixed. The

chrome/browser/gtk/tab_contents_container_gtk.h

 // Copyright (c) 2009 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.
 
 #ifndef CHROME_BROWSER_GTK_TAB_CONTENTS_CONTAINER_GTK_H_
 #define CHROME_BROWSER_GTK_TAB_CONTENTS_CONTAINER_GTK_H_
 
 #include <gtk/gtk.h>
 
 #include "base/basictypes.h"
@@ skipping 40 matching lines @@
   // Called when the RenderViewHost of the hosted TabContents has changed, e.g.
   // to show an interstitial page.
   void RenderViewHostChanged(RenderViewHost* old_host,
                              RenderViewHost* new_host);
 
   // Called when a TabContents is destroyed. This gives us a chance to clean
   // up our internal state if the TabContents is somehow destroyed before we
   // get notified.
   void TabContentsDestroyed(TabContents* contents);
 
-  // Implements our hack around a GtkFixed. The entire size of the GtkFixed is
-  // allocated to normal tab contents views, while the status bubble is
-  // informed of its parent and its parent's allocation (it makes a decision
-  // about layout later.)
-  static void OnFixedSizeAllocate(
-      GtkWidget* fixed,
-      GtkAllocation* allocation,
-      TabContentsContainerGtk* container);
-
   // Handler for |floating_|'s "set-floating-position" signal. During this
   // callback, we manually set the position of the status bubble.
   static void OnSetFloatingPosition(
       GtkFloatingContainer* container, GtkAllocation* allocation,
       TabContentsContainerGtk* tab_contents_container);
 
   NotificationRegistrar registrar_;
 
   // The currently visible TabContents.
   TabContents* tab_contents_;
 
   // The status bubble manager.  Always non-NULL.
   StatusBubbleGtk* status_bubble_;
 
   // Top of the TabContentsContainerGtk widget hierarchy. A cross between a
   // GtkBin and a GtkFixed, |floating_| has |fixed_| as its one "real" child,
   // and the various things that hang off the bottom (status bubble, etc) have
   // their positions manually set in OnSetFloatingPosition.
   OwnedWidgetGtk floating_;
 
-  // We insert and remove TabContents GtkWidgets into this fixed_. This should
-  // not be a GtkVBox since there were errors with timing where the vbox was
-  // horizontally split with the top half displaying the current TabContents
-  // and bottom half displaying the loading page.
-  GtkWidget* fixed_;
+  // We insert TabContentsViewGtks into this container_.  We only show one
+  // TabVontentsViewGtk at a time, so we can use a vbox or an hbox.
+  GtkWidget* container_;
 
   DISALLOW_COPY_AND_ASSIGN(TabContentsContainerGtk);
 };
 
 #endif  // CHROME_BROWSER_GTK_TAB_CONTENTS_CONTAINER_GTK_H_