Do not use the utility process on linux....

chrome/browser/utility_process_host.cc

 // 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.
 
 #include "chrome/browser/utility_process_host.h"
 
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/message_loop.h"
 #include "base/path_service.h"
@@ skipping 46 matching lines @@
 
   Send(new UtilityMsg_ParseUpdateManifest(xml));
   return true;
 }
 
 std::wstring UtilityProcessHost::GetUtilityProcessCmd() {
   return GetChildPath();
 }
 
 bool UtilityProcessHost::StartProcess(const FilePath& exposed_dir) {
+#if defined(OS_POSIX)
+  // TODO(port): We should not reach here on linux (crbug.com/22703) or
+  // MacOS (crbug.com/8102) until problems related to autoupdate are fixed.
+  NOTREACHED();
+  return false;
+#endif
+
   // Name must be set or metrics_service will crash in any test which
   // launches a UtilityProcessHost.
   set_name(L"utility process");
 
   if (!CreateChannel())
     return false;
 
   std::wstring exe_path = GetUtilityProcessCmd();
   if (exe_path.empty()) {
     NOTREACHED() << "Unable to get utility process binary name.";
@@ skipping 72 matching lines @@
     IPC_MESSAGE_HANDLER(UtilityHostMsg_UnpackWebResource_Succeeded,
                         Client::OnUnpackWebResourceSucceeded)
     IPC_MESSAGE_HANDLER(UtilityHostMsg_UnpackWebResource_Failed,
                         Client::OnUnpackWebResourceFailed)
     IPC_MESSAGE_HANDLER(UtilityHostMsg_ParseUpdateManifest_Succeeded,
                         Client::OnParseUpdateManifestSucceeded)
     IPC_MESSAGE_HANDLER(UtilityHostMsg_ParseUpdateManifest_Failed,
                         Client::OnParseUpdateManifestFailed)
   IPC_END_MESSAGE_MAP_EX()
 }