Use PluginPrefs in ChromePluginServiceFilter to check whether a plugin is enabled.

content/common/view_messages.h

 // Copyright (c) 2011 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.
 
 // IPC messages for page rendering.
 // Multiply-included message file, hence no include guard.
 
 #include "base/process.h"
 #include "base/shared_memory.h"
 #include "content/common/common_param_traits.h"
@@ skipping 1527 matching lines @@
                             GURL /* url */,
                             GURL /* first_party_for_cookies */,
                             bool /* cookies_enabled */)
 
 // Used to get the list of plugins
 IPC_SYNC_MESSAGE_CONTROL1_1(ViewHostMsg_GetPlugins,
     bool /* refresh*/,
     std::vector<webkit::npapi::WebPluginInfo> /* plugins */)
 
 // Return information about a plugin for the given URL and MIME
-// type. If there is no matching plugin, |found| is false.  If
-// |enabled| in the WebPluginInfo struct is false, the plug-in is
-// treated as if it was not installed at all.
+// type. If there is no matching plugin, |found| is false.
 // |actual_mime_type| is the actual mime type supported by the
 // plugin found that match the URL given (one for each item in
 // |info|).
 IPC_SYNC_MESSAGE_CONTROL4_3(ViewHostMsg_GetPluginInfo,
                             int /* routing_id */,
                             GURL /* url */,
-                            GURL /* policy_url */,
+                            GURL /* page_url */,
                             std::string /* mime_type */,
                             bool /* found */,
                             webkit::npapi::WebPluginInfo /* plugin info */,
                             std::string /* actual_mime_type */)
 
 // A renderer sends this to the browser process when it wants to
 // create a plugin.  The browser will create the plugin process if
 // necessary, and will return a handle to the channel on success.
 // On error an empty string is returned.
-IPC_SYNC_MESSAGE_CONTROL3_2(ViewHostMsg_OpenChannelToPlugin,
+IPC_SYNC_MESSAGE_CONTROL4_2(ViewHostMsg_OpenChannelToPlugin,
                             int /* routing_id */,
                             GURL /* url */,
+                            GURL /* page_url */,
                             std::string /* mime_type */,
                             IPC::ChannelHandle /* channel_handle */,
                             webkit::npapi::WebPluginInfo /* info */)
 
 // A renderer sends this to the browser process when it wants to create a
 // worker.  The browser will create the worker process if necessary, and
 // will return the route id on success.  On error returns MSG_ROUTING_NONE.
 IPC_SYNC_MESSAGE_CONTROL1_1(ViewHostMsg_CreateWorker,
                             ViewHostMsg_CreateWorker_Params,
                             int /* route_id */)
@@ skipping 460 matching lines @@
                     int32 /* complete status */)
 
 // Request updated information about the client firewall traversal policy.
 // Will result in a ViewMsg_UpdateRemoteAccessClientFirewallTraversal message
 // being sent back.
 IPC_MESSAGE_ROUTED0(ViewHostMsg_RequestRemoteAccessClientFirewallTraversal)
 
 // Notifies the browser of an event occurring in the media pipeline.
 IPC_MESSAGE_CONTROL1(ViewHostMsg_MediaLogEvent,
                      media::MediaLogEvent /* event */)