Adding --disable-plugins-discovery command line switch to not load third-party plugins from common …

content/browser/plugin_service_impl.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 "content/browser/plugin_service_impl.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/files/file_path.h"
@@ skipping 178 matching lines @@
   GetContentClient()->AddNPAPIPlugins(plugin_list_);
 
   // Load any specified on the command line as well.
   base::FilePath path =
       command_line->GetSwitchValuePath(switches::kLoadPlugin);
   if (!path.empty())
     AddExtraPluginPath(path);
   path = command_line->GetSwitchValuePath(switches::kExtraPluginDir);
   if (!path.empty())
     plugin_list_->AddExtraPluginDir(path);
+
+  if (command_line->HasSwitch(switches::kDisablePluginsDiscovery))
+    plugin_list_->DisablePluginsDiscovery();
 }
 
 void PluginServiceImpl::StartWatchingPlugins() {
   // Start watching for changes in the plugin list. This means watching
   // for changes in the Windows registry keys and on both Windows and POSIX
   // watch for changes in the paths that are expected to contain plugins.
 #if defined(OS_WIN)
   if (hkcu_key_.Create(HKEY_CURRENT_USER,
                        webkit::npapi::kRegistryMozillaPlugins,
                        KEY_NOTIFY) == ERROR_SUCCESS) {
@@ skipping 575 matching lines @@
 void PluginServiceImpl::GetInternalPlugins(
     std::vector<webkit::WebPluginInfo>* plugins) {
   plugin_list_->GetInternalPlugins(plugins);
 }
 
 webkit::npapi::PluginList* PluginServiceImpl::GetPluginList() {
   return plugin_list_;
 }
 
 }  // namespace content