GTK: Hide the "Other Bookmarks" button when there are no bookmarks there.

chrome/browser/ui/gtk/bookmarks/bookmark_bar_gtk.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_GTK_BOOKMARKS_BOOKMARK_BAR_GTK_H_
 #define CHROME_BROWSER_UI_GTK_BOOKMARKS_BOOKMARK_BAR_GTK_H_
 #pragma once
 
 #include <gtk/gtk.h>
 
@@ skipping 112 matching lines @@
   // Helper function which generates GtkToolItems for |bookmark_toolbar_|.
   void CreateAllBookmarkButtons();
 
   // Sets the visibility of the instructional text based on whether there are
   // any bookmarks in the bookmark bar node.
   void SetInstructionState();
 
   // Sets the visibility of the overflow chevron.
   void SetChevronState();
 
+  // Shows or hides the other bookmarks button depending on whether there are
+  // bookmarks in it.
+  void UpdateOtherBookmarksVisibility();
+
   // Helper function which destroys all the bookmark buttons in the GtkToolbar.
   void RemoveAllBookmarkButtons();
 
   // Returns the number of buttons corresponding to starred urls/folders. This
   // is equivalent to the number of children the bookmark bar node from the
   // bookmark bar model has.
   int GetBookmarkButtonCount();
 
   // Set the appearance of the overflow button appropriately (either chromium
   // style or GTK style).
@@ skipping 191 matching lines @@
   // bookmarks when there are no bookmarks on the bookmark bar.
   scoped_ptr<BookmarkBarInstructionsGtk> instructions_gtk_;
 
   // GtkToolbar which contains all the bookmark buttons.
   OwnedWidgetGtk bookmark_toolbar_;
 
   // The button that shows extra bookmarks that don't fit on the bookmark
   // bar.
   GtkWidget* overflow_button_;
 
+  // A separator between the main bookmark bar area and
+  // |other_bookmarks_button_|.
+  GtkWidget* other_bookmarks_separator_;
+
   // The other bookmarks button.
   GtkWidget* other_bookmarks_button_;
 
   // The sync error button.
   GtkWidget* sync_error_button_;
 
   // A pointer to the ProfileSyncService instance if one exists.
   ProfileSyncService* sync_service_;
 
   // The BookmarkNode from the model being dragged. NULL when we aren't
@@ skipping 49 matching lines @@
   BooleanPrefMember edit_bookmarks_enabled_;
 
   ScopedRunnableMethodFactory<BookmarkBarGtk> method_factory_;
 
   BookmarkBar::State bookmark_bar_state_;
 
   DISALLOW_COPY_AND_ASSIGN(BookmarkBarGtk);
 };
 
 #endif  // CHROME_BROWSER_UI_GTK_BOOKMARKS_BOOKMARK_BAR_GTK_H_