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

chrome/browser/tab_contents/tab_contents_view_gtk.cc

 // 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.
 
 #include "chrome/browser/tab_contents/tab_contents_view_gtk.h"
 
 #include <gdk/gdk.h>
 #include <gdk/gdkkeysyms.h>
 #include <gtk/gtk.h>
 
@@ skipping 380 matching lines @@
     GdkEventButton* event, TabContentsViewGtk* view) {
   view->last_mouse_down_ = *event;
   return FALSE;
 }
 
 gboolean TabContentsViewGtk::OnSizeAllocate(GtkWidget* widget,
                                             GtkAllocation* allocation,
                                             TabContentsViewGtk* view) {
   int width = allocation->width;
   int height = allocation->height;
-  view->requested_size_.set_width(width);
-  view->requested_size_.set_height(height);
   // |delegate()| can be NULL here during browser teardown.
   if (view->tab_contents()->delegate())
     height += view->tab_contents()->delegate()->GetExtraRenderViewHeight();
   gfx::Size size(width, height);
   view->requested_size_ = size;
   gtk_container_foreach(GTK_CONTAINER(widget), SetSizeRequest, &size);
 
   return FALSE;
 }
 
@@ skipping 49 matching lines @@
     gtk_container_child_set_property(GTK_CONTAINER(floating_container),
                                      widget, "x", &value);
 
     int child_y = std::max(half_view_height - (requisition.height / 2), 0);
     g_value_set_int(&value, child_y);
     gtk_container_child_set_property(GTK_CONTAINER(floating_container),
                                      widget, "y", &value);
     g_value_unset(&value);
   }
 }