Fixes bug in handling of openning background tabs by way of clicking

chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm

 // Copyright (c) 2010 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/location_bar/location_bar_view_mac.h"
 
 #include "app/l10n_util_mac.h"
 #include "app/resource_bundle.h"
 #include "base/stl_util-inl.h"
 #include "base/string_util.h"
@@ skipping 283 matching lines @@
           // that it shouldn't to stick in a NOTREACHED().  In any case, this is
           // harmless.
           delete fetcher;
         } else {
           // The navigation controller will delete the fetcher.
         }
       }
     }
   }
 
-  if (browser_->instant())
+  if (browser_->instant() && !edit_view_->model()->popup_model()->IsOpen())
     browser_->instant()->DestroyPreviewContents();
 
   update_instant_ = true;
 }
 
 void LocationBarViewMac::OnChanged() {
   // Update the location-bar icon.
   const int resource_id = edit_view_->GetIcon();
   NSImage* image = AutocompleteEditViewMac::ImageForResource(resource_id);
   location_icon_decoration_->SetImage(image);
@@ skipping 372 matching lines @@
 
   // These need to change anytime the layout changes.
   // TODO(shess): Anytime the field editor might have changed, the
   // cursor rects almost certainly should have changed.  The tooltips
   // might change even when the rects don't change.
   [field_ resetFieldEditorFrameIfNeeded];
   [field_ updateCursorAndToolTipRects];
 
   [field_ setNeedsDisplay:YES];
 }