Enable nacl_helper by default.

chrome/nacl/nacl_fork_delegate_linux.cc

 // Copyright (c) 2011 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/common/nacl_fork_delegate_linux.h"
 
 #include <signal.h>
 #include <stdlib.h>
 #include <sys/socket.h>
 
@@ skipping 29 matching lines @@
   DCHECK(kNaClBrowserDescriptor == browserdesc);
   DCHECK(kNaClSandboxDescriptor == sandboxdesc);
 
   CHECK(socketpair(PF_UNIX, SOCK_SEQPACKET, 0, fds) == 0);
   base::file_handle_mapping_vector fds_to_map;
   fds_to_map.push_back(std::make_pair(fds[1], kNaClZygoteDescriptor));
   fds_to_map.push_back(std::make_pair(sandboxdesc, kNaClSandboxDescriptor));
   // TODO(bradchen): To make this the default for release builds,
   // remove command line switch.
   ready_ = false;
-  const bool use_helper = CommandLine::ForCurrentProcess()->HasSwitch(
+  // Use helper if kNaClLinuxHelper switch is not found.
+  const bool use_helper = !CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kNaClLinuxHelper);
   FilePath helper_exe;
   FilePath helper_bootstrap_exe;
   if (use_helper &&
       PathService::Get(chrome::FILE_NACL_HELPER, &helper_exe) &&
       PathService::Get(chrome::FILE_NACL_HELPER_BOOTSTRAP,
                        &helper_bootstrap_exe)) {
     CommandLine::StringVector argv = CommandLine::ForCurrentProcess()->argv();
     argv[0] = helper_bootstrap_exe.value();
     argv[1] = helper_exe.value();
@@ skipping 61 matching lines @@
 
 bool NaClForkDelegate::AckChild(const int fd,
                                 const std::string& channel_switch) {
   int nwritten = HANDLE_EINTR(write(fd, channel_switch.c_str(),
                                     channel_switch.length()));
   if (nwritten != static_cast<int>(channel_switch.length())) {
     return false;
   }
   return true;
 }