Allow Flash (and other plugins) to be installed without restarting the browse...

chrome/common/render_messages_internal.h

 // Copyright (c) 2009 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.
 
 // This header is meant to be included in multiple passes, hence no traditional
 // header guard.
 // See ipc_message_macros.h for explanation of the macros and passes.
 
 #include <string>
 #include <vector>
@@ skipping 364 matching lines @@
   // Used to notify the render-view that we have received a target URL. Used
   // to prevent target URLs spamming the browser.
   IPC_MESSAGE_ROUTED0(ViewMsg_UpdateTargetURL_ACK)
 
   // Sets the alternate error page URL (link doctor) for the renderer process.
   IPC_MESSAGE_ROUTED1(ViewMsg_SetAltErrorPageURL, GURL)
 
   // Install the first missing pluign.
   IPC_MESSAGE_ROUTED0(ViewMsg_InstallMissingPlugin)
 
+  // Tells the renderer to empty its plugin list cache.
+  IPC_MESSAGE_CONTROL0(ViewMsg_PurgePluginListCache)
+
   IPC_MESSAGE_ROUTED1(ViewMsg_RunFileChooserResponse,
                       std::vector<FilePath> /* selected files */)
 
   // Used to instruct the RenderView to go into "view source" mode.
   IPC_MESSAGE_ROUTED0(ViewMsg_EnableViewSourceMode)
 
   IPC_MESSAGE_ROUTED2(ViewMsg_UpdateBackForwardListCount,
                       int /* back_list_count */,
                       int /* forward_list_count */)
 
@@ skipping 938 matching lines @@
   IPC_SYNC_MESSAGE_CONTROL1_1(ViewHostMsg_OpenChannelToExtension,
                               std::string /* extension_id */,
                               int /* port_id */)
 
   // Send a message to an extension process.  The handle is the value returned
   // by ViewHostMsg_OpenChannelToExtension.
   IPC_MESSAGE_CONTROL2(ViewHostMsg_ExtensionPostMessage,
                        int /* port_id */,
                        std::string /* message */)
 IPC_END_MESSAGES(ViewHost)