Fix crash when using Instant.

chrome/browser/ui/cocoa/browser_window_controller.mm

 // 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.
 
 #import "chrome/browser/ui/cocoa/browser_window_controller.h"
 
 #include <cmath>
 #include <numeric>
 
 #include "base/command_line.h"
@@ skipping 1567 matching lines @@
   // TODO(viettrungluu): perhaps update to not terminate running animations?
   if (change != TabStripModelObserver::TITLE_NOT_LOADING)
     [self updateBookmarkBarVisibilityWithAnimation:NO];
 }
 
 - (void)onTabDetachedWithContents:(WebContents*)contents {
   TabContents* tabContents = TabContents::FromWebContents(contents);
   [infoBarContainerController_ tabDetachedWithContents:tabContents];
 }
 
+- (void)onInsertTabWithContents:(WebContents*)contents {
+  [previewableContentsController_ onInsertTabWithContents:contents];
+}
+
 - (void)userChangedTheme {
   // TODO(dmaclach): Instead of redrawing the whole window, views that care
   // about the active window state should be registering for notifications.
   [[self window] setViewsNeedDisplay:YES];
 }
 
 - (ui::ThemeProvider*)themeProvider {
   return ThemeServiceFactory::GetForProfile(browser_->profile());
 }
 
@@ skipping 605 matching lines @@
 
 - (BOOL)supportsBookmarkBar {
   return [self supportsWindowFeature:Browser::FEATURE_BOOKMARKBAR];
 }
 
 - (BOOL)isTabbedWindow {
   return browser_->is_type_tabbed();
 }
 
 @end  // @implementation BrowserWindowController(WindowType)