Fix for FocusManager crasher reported from the field

chrome/browser/views/tab_contents/tab_contents_view_win.cc

 // Copyright (c) 2006-2008 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/views/tab_contents/tab_contents_view_win.h"
 
 #include <windows.h>
 
 #include "app/gfx/canvas_paint.h"
 #include "app/os_exchange_data.h"
@@ skipping 308 matching lines @@
     }
     view_storage->RemoveView(last_focused_view_storage_id_);
   }
 }
 
 void TabContentsViewWin::UpdateDragCursor(bool is_drop_target) {
   drop_target_->set_is_drop_target(is_drop_target);
 }
 
 void TabContentsViewWin::GotFocus() {
-  tab_contents()->delegate()->TabContentsFocused(tab_contents());
+  if (tab_contents()->delegate())
+    tab_contents()->delegate()->TabContentsFocused(tab_contents());
 }
 
 void TabContentsViewWin::TakeFocus(bool reverse) {
   if (!tab_contents()->delegate()->TakeFocus(reverse)) {
     views::FocusManager* focus_manager =
         views::FocusManager::GetFocusManager(GetNativeView());
 
     // We may not have a focus manager if the tab has been switched before this
     // message arrived.
     if (focus_manager)
@@ skipping 268 matching lines @@
   }
   return false;
 }
 
 void TabContentsViewWin::WheelZoom(int distance) {
   if (tab_contents()->delegate()) {
     bool zoom_in = distance > 0;
     tab_contents()->delegate()->ContentsZoomChange(zoom_in);
   }
 }