Change visibility semantics for Instant.

chrome/browser/ui/gtk/browser_window_gtk.cc

 // Copyright (c) 2012 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/ui/gtk/browser_window_gtk.h"
 
 #include <gdk/gdkkeysyms.h>
 
 #include <algorithm>
 #include <string>
@@ skipping 1127 matching lines @@
 void BrowserWindowGtk::ShowInstant(TabContents* preview,
                                    int height,
                                    InstantSizeUnits units) {
   // TODO(jered): Support height < 100%.
   DCHECK(height == 100 && units == INSTANT_SIZE_PERCENT);
   contents_container_->SetPreview(preview);
   MaybeShowBookmarkBar(false);
 }
 
 void BrowserWindowGtk::HideInstant() {
-  contents_container_->PopPreview();
+  contents_container_->SetPreview(NULL);
   MaybeShowBookmarkBar(false);
 }
 
 gfx::Rect BrowserWindowGtk::GetInstantBounds() {
   return ui::GetWidgetScreenBounds(contents_container_->widget());
 }
 
 bool BrowserWindowGtk::IsInstantTabShowing() {
   return contents_container_->HasPreview();
 }
@@ skipping 1290 matching lines @@
           wm_type == ui::WM_OPENBOX ||
           wm_type == ui::WM_XFWM4);
 }
 
 // static
 BrowserWindow* BrowserWindow::CreateBrowserWindow(Browser* browser) {
   BrowserWindowGtk* browser_window_gtk = new BrowserWindowGtk(browser);
   browser_window_gtk->Init();
   return browser_window_gtk;
 }