Block NPAPI plugins by default

chrome/browser/about_flags.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/about_flags.h"
 
 #include <iterator>
 #include <map>
 #include <set>
 #include <utility>
@@ skipping 482 matching lines @@
     kOsAll,
     SINGLE_VALUE_TYPE(cc::switches::kShowFPSCounter)
   },
   {
     "disable-webgl",
     IDS_FLAGS_DISABLE_WEBGL_NAME,
     IDS_FLAGS_DISABLE_WEBGL_DESCRIPTION,
     kOsAll,
     SINGLE_VALUE_TYPE(switches::kDisableExperimentalWebGL)
   },
+#if defined(OS_WIN) || defined(OS_MACOSX)
+  {
+    "enable-npapi",
+    IDS_FLAGS_ENABLE_NPAPI_NAME,
+    IDS_FLAGS_ENABLE_NPAPI_DESCRIPTION,
+    kOsWin | kOsMac,
+    SINGLE_VALUE_TYPE(switches::kEnableNpapi)
+  },
+#endif
   {
     "disable-webrtc",
     IDS_FLAGS_DISABLE_WEBRTC_NAME,
     IDS_FLAGS_DISABLE_WEBRTC_DESCRIPTION,
     kOsAndroid,
 #if defined(OS_ANDROID)
     SINGLE_VALUE_TYPE(switches::kDisableWebRTC)
 #else
     SINGLE_VALUE_TYPE("")
 #endif
@@ skipping 2178 matching lines @@
 }
 
 const Experiment* GetExperiments(size_t* count) {
   *count = num_experiments;
   return experiments;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags