Making BrowserNavigator open file browser singleton tab respecting URLs ref value

chrome/browser/ui/browser_navigator.cc

 // Copyright (c) 2011 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/browser_navigator.h"
 
 #include <algorithm>
 
 #include "base/command_line.h"
 #include "chrome/browser/browser_about_handler.h"
@@ skipping 275 matching lines @@
     : url(a_url),
       target_contents(NULL),
       source_contents(NULL),
       disposition(CURRENT_TAB),
       transition(a_transition),
       tabstrip_index(-1),
       tabstrip_add_types(TabStripModel::ADD_ACTIVE),
       window_action(NO_ACTION),
       user_gesture(true),
       path_behavior(RESPECT),
+      ref_behavior(IGNORE_REF),
       browser(a_browser),
       profile(NULL) {
 }
 
 NavigateParams::NavigateParams(Browser* a_browser,
                                TabContentsWrapper* a_target_contents)
     : target_contents(a_target_contents),
       source_contents(NULL),
       disposition(CURRENT_TAB),
       transition(PageTransition::LINK),
       tabstrip_index(-1),
       tabstrip_add_types(TabStripModel::ADD_ACTIVE),
       window_action(NO_ACTION),
       user_gesture(true),
       path_behavior(RESPECT),
+      ref_behavior(IGNORE_REF),
       browser(a_browser),
       profile(NULL) {
 }
 
 NavigateParams::~NavigateParams() {
 }
 
 void Navigate(NavigateParams* params) {
   Browser* source_browser = params->browser;
   AdjustNavigateParamsForURL(params);
@@ skipping 173 matching lines @@
 
   // If there are several matches: prefer the active tab by starting there.
   int start_index = std::max(0, params->browser->active_index());
   int tab_count = params->browser->tab_count();
   for (int i = 0; i < tab_count; ++i) {
     int tab_index = (start_index + i) % tab_count;
     TabContentsWrapper* tab =
         params->browser->GetTabContentsWrapperAt(tab_index);
 
     url_canon::Replacements<char> replacements;
-    replacements.ClearRef();
+    if (params->ref_behavior == browser::NavigateParams::IGNORE_REF)
+      replacements.ClearRef();
     if (params->path_behavior == browser::NavigateParams::IGNORE_AND_NAVIGATE ||
         params->path_behavior == browser::NavigateParams::IGNORE_AND_STAY_PUT) {
       replacements.ClearPath();
       replacements.ClearQuery();
     }
 
     if (CompareURLsWithReplacements(tab->tab_contents()->GetURL(),
                                     params->url, replacements) ||
         CompareURLsWithReplacements(tab->tab_contents()->GetURL(),
                                     rewritten_url, replacements)) {
       params->target_contents = tab;
       return tab_index;
     }
   }
 
   return -1;
 }
 
 }  // namespace browser