Use PluginPrefs in ChromePluginServiceFilter to check whether a plugin is enabled.

chrome/browser/profiles/profile_io_data.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/profiles/profile_io_data.h"
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/stl_util.h"
 #include "base/string_number_conversions.h"
 #include "base/task.h"
 #include "chrome/browser/browser_process.h"
+#include "chrome/browser/chrome_plugin_service_filter.h"
 #include "chrome/browser/content_settings/host_content_settings_map.h"
 #include "chrome/browser/custom_handlers/protocol_handler_registry.h"
 #include "chrome/browser/extensions/extension_info_map.h"
 #include "chrome/browser/extensions/extension_protocols.h"
 #include "chrome/browser/io_thread.h"
 #include "chrome/browser/media/media_internals.h"
 #include "chrome/browser/net/chrome_cookie_notification_details.h"
 #include "chrome/browser/net/chrome_dns_cert_provenance_checker_factory.h"
 #include "chrome/browser/net/chrome_net_log.h"
 #include "chrome/browser/net/chrome_network_delegate.h"
@@ skipping 156 matching lines @@
     return profile->GetPrerenderManager();
   return NULL;
 }
 
 }  // namespace
 
 void ProfileIOData::InitializeProfileParams(Profile* profile) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   PrefService* pref_service = profile->GetPrefs();
 
+  ChromePluginServiceFilter::GetInstance()->RegisterResourceContext(
+      profile, resource_context_);
+
   scoped_ptr<ProfileParams> params(new ProfileParams);
   params->is_incognito = profile->IsOffTheRecord();
   params->clear_local_state_on_exit =
       pref_service->GetBoolean(prefs::kClearSiteDataOnExit);
 
   params->appcache_service = profile->GetAppCacheService();
 
   // Set up Accept-Language and Accept-Charset header values
   params->accept_language = net::HttpUtil::GenerateAcceptLanguageHeader(
       pref_service->GetString(prefs::kAcceptLanguages));
@@ skipping 297 matching lines @@
   context->set_transport_security_state(
       profile_params_->transport_security_state);
   context->set_ssl_config_service(profile_params_->ssl_config_service);
 }
 
 void ProfileIOData::ShutdownOnUIThread() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   enable_referrers_.Destroy();
   clear_local_state_on_exit_.Destroy();
   safe_browsing_enabled_.Destroy();
+  ChromePluginServiceFilter::GetInstance()->UnregisterResourceContext(
+      resource_context_);
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       base::Bind(
           &ResourceDispatcherHost::CancelRequestsForContext,
           base::Unretained(g_browser_process->resource_dispatcher_host()),
           &resource_context_));
   bool posted = BrowserThread::PostTask(BrowserThread::IO, FROM_HERE,
                                         new DeleteTask<ProfileIOData>(this));
   if (!posted)
     delete this;
 }