Block NPAPI plugins by default

content/public/common/content_switches.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/public/common/content_switches.h"
 
 #include "base/command_line.h"
 #include "base/metrics/field_trial.h"
 
 namespace switches {
@@ skipping 937 matching lines @@
     "disable-win32k-renderer-lockdown";
 const char kEnableWin32kRendererLockDown[] =
     "enable-win32k-renderer-lockdown";
 
 // DirectWrite FontCache is shared by browser to renderers using shared memory.
 // This switch allows specifying suffix to shared memory section name to avoid
 // clashes between different instances of Chrome.
 const char kFontCacheSharedMemSuffix[] = "font-cache-shared-mem-suffix";
 #endif
 
+// Enables the use of NPAPI plugins.
+const char kEnableNpapi[]                   = "enable-npapi";
+
 #if defined(ENABLE_PLUGINS)
 // Enables the plugin power saver feature.
 const char kEnablePluginPowerSaver[] = "enable-plugin-power-saver";
 #endif
 
 #if defined(OS_WIN)
 bool IsWin32kRendererLockdownEnabled() {
   const std::string group_name =
       base::FieldTrialList::FindFullName("Win32kLockdown");
   const base::CommandLine* cmd_line = base::CommandLine::ForCurrentProcess();
   if (cmd_line->HasSwitch(kEnableWin32kRendererLockDown))
     return true;
   if (cmd_line->HasSwitch(kDisableWin32kRendererLockDown))
     return false;
   // Default.
   return group_name == "Enabled";
 }
 #endif
 
 // Don't dump stuff here, follow the same order as the header.
 
 }  // namespace switches