Fix crash when using Instant.

chrome/browser/ui/cocoa/tabs/tab_strip_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/tabs/tab_strip_controller.h"
 
 #import <QuartzCore/QuartzCore.h>
 
 #include <cmath>
 #include <limits>
@@ skipping 1190 matching lines @@
   // something similar in |-layoutTabs| confuses the window server.
   [newView setFrame:NSOffsetRect([newView frame],
                                  0, -[[self class] defaultTabHeight])];
 
   [self setTabTitle:newController withContents:contents->web_contents()];
 
   // If a tab is being inserted, we can again use the entire tab strip width
   // for layout.
   availableResizeWidth_ = kUseFullAvailableWidth;
 
+  [delegate_ onInsertTabWithContents:contents->web_contents()];
+
   // We don't need to call |-layoutTabs| if the tab will be in the foreground
   // because it will get called when the new tab is selected by the tab model.
   // Whenever |-layoutTabs| is called, it'll also add the new subview.
   if (!inForeground) {
     [self layoutTabs];
   }
 
   // During normal loading, we won't yet have a favicon and we'll get
   // subsequent state change notifications to show the throbber, but when we're
   // dragging a tab out into a new window, we have to put the tab's favicon
@@ skipping 888 matching lines @@
 NSView* GetSheetParentViewForTabContents(TabContents* tab_contents) {
   // View hierarchy of the contents view:
   // NSView  -- switchView, same for all tabs
   // +- NSView  -- TabContentsController's view
   //    +- TabContentsViewCocoa
   //
   // Changing it? Do not forget to modify
   // -[TabStripController swapInTabAtIndex:] too.
   return [tab_contents->web_contents()->GetNativeView() superview];
 }