Fix "Set pages" drop crash by changing outside drags to simply add a new URL

chrome/browser/ui/webui/options/startup_pages_handler.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 "chrome/browser/ui/webui/options/startup_pages_handler.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/autocomplete/autocomplete_classifier.h"
@@ skipping 133 matching lines @@
         selected_index >= startup_custom_pages_table_model_->RowCount()) {
       NOTREACHED();
       return;
     }
     startup_custom_pages_table_model_->Remove(selected_index);
   }
 }
 
 void StartupPagesHandler::AddStartupPage(const ListValue* args) {
   std::string url_string;
-  CHECK_EQ(args->GetSize(), 1U);
   CHECK(args->GetString(0, &url_string));
 
   GURL url = URLFixerUpper::FixupURL(url_string, std::string());
   if (!url.is_valid())
     return;
-  int index = startup_custom_pages_table_model_->RowCount();
+
+  int row_count = startup_custom_pages_table_model_->RowCount();
+  int index;
+  if (!args->GetInteger(1, &index) || index > row_count)
+    index = row_count;
+
   startup_custom_pages_table_model_->Add(index, url);
 }
 
 void StartupPagesHandler::EditStartupPage(const ListValue* args) {
   std::string url_string;
   int index;
   CHECK_EQ(args->GetSize(), 2U);
   CHECK(args->GetInteger(0, &index));
   CHECK(args->GetString(1, &url_string));
 
@@ skipping 61 matching lines @@
 
 void StartupPagesHandler::OnResultChanged(bool default_match_changed) {
   const AutocompleteResult& result = autocomplete_controller_->result();
   ListValue suggestions;
   OptionsUI::ProcessAutocompleteSuggestions(result, &suggestions);
   web_ui()->CallJavascriptFunction(
       "StartupOverlay.updateAutocompleteSuggestions", suggestions);
 }
 
 }  // namespace options