Make app list search result mixer more resilient to reordering.

ui/app_list/views/search_result_list_view.cc

 // 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.
 
 #include "ui/app_list/views/search_result_list_view.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 243 matching lines @@
     GetResultViewAt(i)->ClearResultNoRepaint();
 
   ScheduleUpdate();
 }
 
 void SearchResultListView::ListItemMoved(size_t index, size_t target_index) {
   NOTREACHED();
 }
 
 void SearchResultListView::ListItemsChanged(size_t start, size_t count) {
-  ScheduleUpdate();
+  NOTREACHED();
 }
 
 void SearchResultListView::SearchResultActivated(SearchResultView* view,
                                                  int event_flags) {
   if (view_delegate_ && view->result())
     view_delegate_->OpenSearchResult(view->result(), false, event_flags);
 }
 
 void SearchResultListView::SearchResultActionActivated(SearchResultView* view,
                                                        size_t action_index,
                                                        int event_flags) {
   if (view_delegate_ && view->result()) {
     view_delegate_->InvokeSearchResultAction(
         view->result(), action_index, event_flags);
   }
 }
 
 void SearchResultListView::OnSearchResultInstalled(SearchResultView* view) {
   if (delegate_ && view->result())
     delegate_->OnResultInstalled(view->result());
 }
 
 void SearchResultListView::OnSearchResultUninstalled(SearchResultView* view) {
   if (delegate_ && view->result())
     delegate_->OnResultUninstalled(view->result());
 }
 
 }  // namespace app_list