Let IPC::SyncMessageFilter take advantage of thread-safe Send.

ppapi/nacl_irt/manifest_service.cc

 // Copyright 2014 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 "ppapi/nacl_irt/manifest_service.h"
 
 #include "base/single_thread_task_runner.h"
 #include "ipc/ipc_channel_handle.h"
 #include "ipc/ipc_channel_proxy.h"
 #include "ipc/ipc_sync_message_filter.h"
@@ skipping 10 matching lines @@
 
 namespace ppapi {
 
 // IPC channel is asynchronously set up. So, the NaCl process may try to
 // send a OpenResource message to the host before the connection is
 // established. In such a case, it is necessary to wait for the set up
 // completion.
 class ManifestMessageFilter : public IPC::SyncMessageFilter {
  public:
   ManifestMessageFilter(base::WaitableEvent* shutdown_event)
-      : SyncMessageFilter(shutdown_event),
+      : SyncMessageFilter(shutdown_event,
+                          false /* is_channel_send_thread_safe */),
         connected_event_(
             true /* manual_reset */, false /* initially_signaled */) {
   }
 
   bool Send(IPC::Message* message) override {
     // Wait until set up is actually done.
     connected_event_.Wait();
     return SyncMessageFilter::Send(message);
   }
 
@@ skipping 120 matching lines @@
 
   ManifestService* manifest_service = GetManifestService();
   if (manifest_service == NULL ||
       !manifest_service->OpenResource(file, fd)) {
     return NACL_ABI_EIO;
   }
   return (*fd == -1) ? NACL_ABI_ENOENT : 0;
 }
 
 }  // namespace ppapi