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

webkit/plugins/npapi/plugin_list_posix.cc

Index: webkit/plugins/npapi/plugin_list_posix.cc
===================================================================
--- webkit/plugins/npapi/plugin_list_posix.cc	(revision 204507)
+++ webkit/plugins/npapi/plugin_list_posix.cc	(working copy)
@@ -435,10 +435,13 @@
   // We first consult Chrome-specific dirs, then fall back on the logic
   // Mozilla uses.
 
-  // Note: "extra" plugin dirs, including the Plugins subdirectory of
-  // your Chrome config, are examined before these.  See the logic
-  // related to extra_plugin_dirs in plugin_list.cc.
+  if (PluginList::plugins_discovery_disabled_)
+    return;
 
+  // Note: "extra" plugin dirs and paths are examined before these.
+  // "Extra" are those added by PluginList::AddExtraPluginDir() and
+  // PluginList::AddExtraPluginPath().
+
   // The Chrome binary dir + "plugins/".
   base::FilePath dir;
   PathService::Get(base::DIR_EXE, &dir);