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

chrome/browser/extensions/extension_context_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/extensions/extension_context_menu_model.h"
 
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_tab_util.h"
 #include "chrome/browser/prefs/pref_service.h"
@@ skipping 93 matching lines @@
 }
 
 void ExtensionContextMenuModel::ExecuteCommand(int command_id) {
   const Extension* extension = GetExtension();
   if (!extension)
     return;
 
   switch (command_id) {
     case NAME: {
       browser_->OpenURL(extension->GetHomepageURL(), GURL(),
-                        NEW_FOREGROUND_TAB, PageTransition::LINK);
+                        NEW_FOREGROUND_TAB, content::PAGE_TRANSITION_LINK);
       break;
     }
     case CONFIGURE:
       DCHECK(!extension->options_url().is_empty());
       profile_->GetExtensionProcessManager()->OpenOptionsPage(extension,
                                                               browser_);
       break;
     case HIDE: {
       ExtensionService* extension_service = profile_->GetExtensionService();
       extension_service->SetBrowserActionVisibility(extension, false);
@@ skipping 34 matching lines @@
 }
 
 void ExtensionContextMenuModel::ExtensionUninstallCanceled() {
   Release();
 }
 
 const Extension* ExtensionContextMenuModel::GetExtension() const {
   ExtensionService* extension_service = profile_->GetExtensionService();
   return extension_service->GetExtensionById(extension_id_, false);
 }