Make IPC::Channel::Listener:OnMessageReceived have a return value indicating ...

chrome/browser/nacl_host/nacl_process_host.cc

 // 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 "build/build_config.h"
 
 #include "chrome/browser/nacl_host/nacl_process_host.h"
 
 #if defined(OS_POSIX)
 #include <fcntl.h>
@@ skipping 264 matching lines @@
     return;
   }
   memory_fd.auto_close = true;
   handles_for_sel_ldr.push_back(memory_fd);
 #endif
 
   Send(new NaClProcessMsg_Start(handles_for_sel_ldr));
   sockets_for_sel_ldr_.clear();
 }
 
-void NaClProcessHost::OnMessageReceived(const IPC::Message& msg) {
+bool NaClProcessHost::OnMessageReceived(const IPC::Message& msg) {
   NOTREACHED() << "Invalid message with type = " << msg.type();
+  return false;
 }
 
 bool NaClProcessHost::CanShutdown() {
   return true;
 }
 
 #if defined(OS_WIN)
 // TODO(gregoryd): invoke CheckIsWow64 only once, not for each NaClProcessHost
 typedef BOOL (WINAPI *LPFN_ISWOW64PROCESS) (HANDLE, PBOOL);
 void NaClProcessHost::CheckIsWow64() {
   LPFN_ISWOW64PROCESS fnIsWow64Process;
 
   fnIsWow64Process = (LPFN_ISWOW64PROCESS) GetProcAddress(
       GetModuleHandle(TEXT("kernel32")),
       "IsWow64Process");
 
   if (fnIsWow64Process != NULL) {
     BOOL bIsWow64 = FALSE;
     if (fnIsWow64Process(GetCurrentProcess(),&bIsWow64)) {
       if (bIsWow64) {
         running_on_wow64_ = true;
       }
     }
   }
 }
 #endif