Fix bug where transient pages would miss events dispatched while it was

chrome/common/extensions/extension_messages.h

 // Copyright (c) 2012 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 extensions.
 // Multiply-included message file, hence no include guard.
 
 #include "base/shared_memory.h"
 #include "base/values.h"
 #include "chrome/common/extensions/extension.h"
@@ skipping 313 matching lines @@
                      std::string /* extension_id */,
                      std::string /* name */)
 
 // Notify the browser that the given extension is no longer interested in
 // receiving the given event from a lazy background page.
 IPC_MESSAGE_CONTROL2(ExtensionHostMsg_RemoveLazyListener,
                      std::string /* extension_id */,
                      std::string /* name */)
 
 // Notify the browser that an event has finished being dispatched.
-IPC_MESSAGE_CONTROL1(ExtensionHostMsg_ExtensionEventAck,
-                     std::string /* extension_id */)
-
+IPC_MESSAGE_ROUTED0(ExtensionHostMsg_EventAck)
 
 // Open a channel to all listening contexts owned by the extension with
 // the given ID.  This always returns a valid port ID which can be used for
 // sending messages.  If an error occurred, the opener will be notified
 // asynchronously.
 IPC_SYNC_MESSAGE_CONTROL4_1(ExtensionHostMsg_OpenChannelToExtension,
                             int /* routing_id */,
                             std::string /* source_extension_id */,
                             std::string /* target_extension_id */,
                             std::string /* channel_name */,
@@ skipping 63 matching lines @@
 IPC_MESSAGE_CONTROL2(ExtensionHostMsg_ShouldUnloadAck,
                      std::string /* extension_id */,
                      int /* sequence_id */)
 
 // Response to ExtensionMsg_Unload, after we dispatch the unload event.
 IPC_MESSAGE_CONTROL1(ExtensionHostMsg_UnloadAck,
                      std::string /* extension_id */)
 
 // Informs the browser to increment the keepalive count for the lazy background
 // page, keeping it alive.
-IPC_MESSAGE_CONTROL1(ExtensionHostMsg_IncrementLazyKeepaliveCount,
-                     std::string /* extension_id */)
+IPC_MESSAGE_ROUTED0(ExtensionHostMsg_IncrementLazyKeepaliveCount)
 
 // Informs the browser there is one less thing keeping the lazy background page
 // alive.
-IPC_MESSAGE_CONTROL1(ExtensionHostMsg_DecrementLazyKeepaliveCount,
-                     std::string /* extension_id */)
+IPC_MESSAGE_ROUTED0(ExtensionHostMsg_DecrementLazyKeepaliveCount)
 
 // Fetches a globally unique ID (for the lifetime of the browser) from the
 // browser process.
 IPC_SYNC_MESSAGE_CONTROL0_1(ExtensionHostMsg_GenerateUniqueID,
                             int /* unique_id */)