DOMUI: Use ShowSingletonTab to open the settings tab.

chrome/browser/ui/browser_navigator.h

Index: chrome/browser/ui/browser_navigator.h
diff --git a/chrome/browser/ui/browser_navigator.h b/chrome/browser/ui/browser_navigator.h
index aee08db4f4a86bc345a0f58db4d9ab7d394874e5..f472f2a92ca3989a502dfa49651ca05ba51ff0a9 100644
--- a/chrome/browser/ui/browser_navigator.h
+++ b/chrome/browser/ui/browser_navigator.h
@@ -116,6 +116,10 @@ struct NavigateParams {
   // Default is false.
   bool show_window;
 
+  // True if the paths of the target content's URL and |url| should be ignored
+  // when locating a singleton tab.
+  bool ignore_path;
+
   // [in]  Specifies a Browser object where the navigation could occur or the
   //       tab could be added. Navigate() is not obliged to use this Browser if
   //       it is not compatible with the operation being performed. If NULL,