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

chrome/browser/ui/panels/panel_settings_menu_model.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/panels/panel_settings_menu_model.h"
 
 #include "base/logging.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 59 matching lines @@
 void PanelSettingsMenuModel::ExecuteCommand(int command_id) {
   const Extension* extension = panel_->GetExtension();
   DCHECK(extension);
 
   Browser* browser = panel_->browser();
   switch (command_id) {
     case COMMAND_NAME:
      browser->OpenURL(extension->GetHomepageURL(),
                       GURL(),
                       NEW_FOREGROUND_TAB,
-                      PageTransition::LINK);
+                      content::PAGE_TRANSITION_LINK);
       break;
     case COMMAND_CONFIGURE:
       DCHECK(!extension->options_url().is_empty());
       browser->GetProfile()->GetExtensionProcessManager()->OpenOptionsPage(
           extension, browser);
       break;
     case COMMAND_DISABLE:
       browser->GetProfile()->GetExtensionService()->DisableExtension(
           extension->id());
       break;
@@ skipping 16 matching lines @@
 void PanelSettingsMenuModel::ExtensionUninstallAccepted() {
   const Extension* extension = panel_->GetExtension();
   DCHECK(extension);
 
   panel_->browser()->GetProfile()->GetExtensionService()->
       UninstallExtension(extension->id(), false, NULL);
 }
 
 void PanelSettingsMenuModel::ExtensionUninstallCanceled() {
 }