Adds a pref and a policy to decide if PDFs should always be opened externally.

chrome/browser/plugins/plugin_prefs_factory.cc

 // Copyright (c) 2012 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/plugins/plugin_prefs_factory.h"
 
 #include "base/path_service.h"
 #include "chrome/browser/plugins/plugin_prefs.h"
 #include "chrome/browser/profiles/incognito_helpers.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 43 matching lines @@
 void PluginPrefsFactory::RegisterProfilePrefs(
     user_prefs::PrefRegistrySyncable* registry) {
   base::FilePath internal_dir;
   PathService::Get(chrome::DIR_INTERNAL_PLUGINS, &internal_dir);
   registry->RegisterFilePathPref(prefs::kPluginsLastInternalDirectory,
                                  internal_dir);
   registry->RegisterListPref(prefs::kPluginsPluginsList);
   registry->RegisterListPref(prefs::kPluginsDisabledPlugins);
   registry->RegisterListPref(prefs::kPluginsDisabledPluginsExceptions);
   registry->RegisterListPref(prefs::kPluginsEnabledPlugins);
+  registry->RegisterBooleanPref(prefs::kPluginsAlwaysOpenPdfExternally, false);
 }
 
 content::BrowserContext* PluginPrefsFactory::GetBrowserContextToUse(
     content::BrowserContext* context) const {
   return chrome::GetBrowserContextRedirectedInIncognito(context);
 }
 
 bool PluginPrefsFactory::ServiceIsNULLWhileTesting() const {
   return true;
 }
 
 bool PluginPrefsFactory::ServiceIsCreatedWithBrowserContext() const {
   return true;
 }