Change the "Disable outdated plug-ins" lab to block them instead.

chrome/common/render_messages_internal.h

 // Copyright (c) 2010 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 <map>
 #include <string>
 #include <vector>
 
 #include "build/build_config.h"
 
@@ skipping 1802 matching lines @@
 // Notifies when default plugin updates status of the missing plugin.
 IPC_MESSAGE_ROUTED1(ViewHostMsg_MissingPluginStatus,
                     int /* status */)
 
 // Sent by the renderer process to indicate that a plugin instance has
 // crashed.
 IPC_MESSAGE_ROUTED1(ViewHostMsg_CrashedPlugin,
                     FilePath /* plugin_path */)
 
 // Notifies when a plugin couldn't be loaded because it's outdated.
-IPC_MESSAGE_ROUTED2(ViewHostMsg_DisabledOutdatedPlugin,
+IPC_MESSAGE_ROUTED2(ViewHostMsg_BlockedOutdatedPlugin,
                     string16, /* name */
                     GURL      /* update_url */)
 
 // Displays a JavaScript out-of-memory message in the infobar.
 IPC_MESSAGE_ROUTED0(ViewHostMsg_JSOutOfMemory)
 
 // Displays a box to confirm that the user wants to navigate away from the
 // page. Replies true if yes, false otherwise, the reply string is ignored,
 // but is included so that we can use OnJavaScriptMessageBoxClosed.
 IPC_SYNC_MESSAGE_ROUTED2_2(ViewHostMsg_RunBeforeUnloadConfirm,
@@ skipping 830 matching lines @@
 IPC_SYNC_MESSAGE_CONTROL1_2(ViewHostMsg_PepperQueryFile,
                             FilePath /* path */,
                             base::PlatformFileInfo, /* info */
                             base::PlatformFileError /* error_code */)
 
 // Get the directory's contents.
 IPC_SYNC_MESSAGE_CONTROL1_2(ViewHostMsg_PepperGetDirContents,
                             FilePath /* path */,
                             PepperDirContents, /* contents */
                             base::PlatformFileError /* error_code */)