Block NPAPI plugins by default

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 172 matching lines @@
   base::FilePath path =
       command_line->GetSwitchValuePath(switches::kLoadPlugin);
   if (!path.empty())
     AddExtraPluginPath(path);
   path = command_line->GetSwitchValuePath(switches::kExtraPluginDir);
   if (!path.empty())
     PluginList::Singleton()->AddExtraPluginDir(path);
 
   if (command_line->HasSwitch(switches::kDisablePluginsDiscovery))
     PluginList::Singleton()->DisablePluginsDiscovery();
+#if defined(OS_WIN) || defined(OS_MACOSX)
+  npapi_plugins_enabled_ = command_line->HasSwitch(switches::kEnableNpapi);
+#endif
 }
 
 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,
                        kRegistryMozillaPlugins,
                        KEY_NOTIFY) == ERROR_SUCCESS) {
@@ skipping 591 matching lines @@
   PluginList::Singleton()->UnregisterInternalPlugin(path);
 }
 
 void PluginServiceImpl::GetInternalPlugins(
     std::vector<WebPluginInfo>* plugins) {
   PluginList::Singleton()->GetInternalPlugins(plugins);
 }
 
 bool PluginServiceImpl::NPAPIPluginsSupported() {
 #if defined(OS_WIN) || defined(OS_MACOSX)
-  return true;
+  return npapi_plugins_enabled_;
 #else
   return false;
 #endif
 }
 
 void PluginServiceImpl::DisablePluginsDiscoveryForTesting() {
   PluginList::Singleton()->DisablePluginsDiscovery();
 }
 
+#if defined(OS_WIN) || defined(OS_MACOSX)
+void PluginServiceImpl::EnableNpapiPluginsForTesting() {
+  npapi_plugins_enabled_ = true;
+}
+#endif
+
 #if defined(OS_MACOSX)
 void PluginServiceImpl::AppActivated() {
   BrowserThread::PostTask(BrowserThread::IO, FROM_HERE,
                           base::Bind(&NotifyPluginsOfActivation));
 }
 #elif defined(OS_WIN)
 
 bool GetPluginPropertyFromWindow(
     HWND window, const wchar_t* plugin_atom_property,
     base::string16* plugin_property) {
@@ skipping 35 matching lines @@
 #endif
 
 bool PluginServiceImpl::PpapiDevChannelSupported(
     BrowserContext* browser_context,
     const GURL& document_url) {
   return content::GetContentClient()->browser()->
       IsPluginAllowedToUseDevChannelAPIs(browser_context, document_url);
 }
 
 }  // namespace content