Move PageTransition into content namespace. While I'm touching all these files, I've also updated...

chrome/browser/ui/gtk/global_bookmark_menu.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/gtk/global_bookmark_menu.h"
 
 #include <dlfcn.h>
 #include <gtk/gtk.h>
 
 #include "base/bind.h"
@@ skipping 245 matching lines @@
   RebuildMenuInFuture();
 }
 
 void GlobalBookmarkMenu::OnBookmarkItemActivated(GtkWidget* menu_item) {
   // The actual mouse event that generated this activated event was in a
   // different process. Go with something default.
   const BookmarkNode* node = static_cast<const BookmarkNode*>(
       g_object_get_data(G_OBJECT(menu_item), "bookmark-node"));
 
   browser_->OpenURL(OpenURLParams(node->url(), GURL(), NEW_FOREGROUND_TAB,
-                    PageTransition::AUTO_BOOKMARK));
+                    content::PAGE_TRANSITION_AUTO_BOOKMARK));
 }