Possible fix / workaround for issue where infobar fails to show...

chrome/browser/cocoa/infobar_container_controller.mm

 // 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 "base/logging.h"
 #include "base/mac_util.h"
 #import "chrome/browser/cocoa/animatable_view.h"
 #include "chrome/browser/cocoa/infobar.h"
 #import "chrome/browser/cocoa/infobar_container_controller.h"
 #import "chrome/browser/cocoa/infobar_controller.h"
@@ skipping 105 matching lines @@
 // TabStripModelObserverBridge notifications
 - (void)selectTabWithContents:(TabContents*)newContents
              previousContents:(TabContents*)oldContents
                       atIndex:(NSInteger)index
                   userGesture:(bool)wasUserGesture {
   [self changeTabContents:newContents];
 }
 
 - (void)tabDetachedWithContents:(TabContents*)contents
                         atIndex:(NSInteger)index {
-  [self changeTabContents:NULL];
+  if (currentTabContents_ == contents)

[rohitrao (ping after 24h), 2010/04/21 14:00:52]

This doesn't quite match the logic in browser_view.cc, but it should work fine.

+    [self changeTabContents:NULL];
 }
 
 - (void)resizeView:(NSView*)view newHeight:(CGFloat)height {
   NSRect frame = [view frame];
   frame.size.height = height;
   [view setFrame:frame];
   [self positionInfoBarsAndRedraw];
 }
 
 - (void)setAnimationInProgress:(BOOL)inProgress {
@@ skipping 92 matching lines @@
     frame.size.width = NSWidth(containerBounds);
     frame.origin.y = minY;
     minY += frame.size.height;
     [view setFrame:frame];
   }
 
   [resizeDelegate_ resizeView:[self view] newHeight:[self desiredHeight]];
 }
 
 @end