Implement chrome://plugins page that can disable plugins.

webkit/glue/plugins/plugin_lib_mac.mm

Index: webkit/glue/plugins/plugin_lib_mac.mm
diff --git a/webkit/glue/plugins/plugin_lib_mac.mm b/webkit/glue/plugins/plugin_lib_mac.mm
index 64d34c3fe52e0a535af3b0a106f802c6f88d537f..b6ced704574f71b7b240e500eecf72bd6794c7a3 100644
--- a/webkit/glue/plugins/plugin_lib_mac.mm
+++ b/webkit/glue/plugins/plugin_lib_mac.mm
@@ -123,6 +123,7 @@ bool ReadPlistPluginInfo(const FilePath& filename, CFBundleRef bundle,
     info->desc = base::SysNSStringToWide(plugin_desc);
   else
     info->desc = UTF8ToWide(filename.BaseName().value());
+  info->enabled = true;
 
   return true;
 }
@@ -220,6 +221,7 @@ bool ReadSTRPluginInfo(const FilePath& filename, CFBundleRef bundle,
     info->desc = UTF8ToWide(plugin_descs[0]);
   else
     info->desc = UTF8ToWide(filename.BaseName().value());
+  info->enabled = true;
 
   return true;
 }