Add --use-more-webui runtime flag to toggle WebUI replacements for native dialogs.

chrome/browser/ui/gtk/bookmarks/bookmark_bubble_gtk.cc

Index: chrome/browser/ui/gtk/bookmarks/bookmark_bubble_gtk.cc
diff --git a/chrome/browser/ui/gtk/bookmarks/bookmark_bubble_gtk.cc b/chrome/browser/ui/gtk/bookmarks/bookmark_bubble_gtk.cc
index a27505bab0e6ac7a80f099ccc0419ba6023201e9..79fc82f2b799ab3d9455a954f1154d3354b83a25 100644
--- a/chrome/browser/ui/gtk/bookmarks/bookmark_bubble_gtk.cc
+++ b/chrome/browser/ui/gtk/bookmarks/bookmark_bubble_gtk.cc
@@ -308,25 +308,17 @@ void BookmarkBubbleGtk::ShowEditor() {
   // Commit any edits now.
   ApplyEdits();
 
-#if !defined(WEBUI_DIALOGS)
   // Closing might delete us, so we'll cache what we need on the stack.
   Profile* profile = profile_;
   GtkWindow* toplevel = GTK_WINDOW(gtk_widget_get_toplevel(anchor_));
-#endif
 
   // Close the bubble, deleting the C++ objects, etc.
   bubble_->Close();
 
   if (node) {
-#if defined(WEBUI_DIALOGS)
-    Browser* browser = BrowserList::GetLastActiveWithProfile(profile_);
-    DCHECK(browser);
-    browser->OpenBookmarkManagerEditNode(node->id());
-#else
-    BookmarkEditor::Show(toplevel, profile, NULL,
-                         BookmarkEditor::EditDetails(node),
+    BookmarkEditor::Show(toplevel, profile,
+                         BookmarkEditor::EditDetails::EditNode(node),
                          BookmarkEditor::SHOW_TREE);
-#endif
   }
 }