Remove is_win/OS_WIN checks in shell code

shell/child_process_host.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 "shell/child_process_host.h"
 
 #include "base/base_switches.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/location.h"
@@ skipping 57 matching lines @@
   child_command_line.CopySwitchesFrom(*parent_command_line, kForwardSwitches,
                                       arraysize(kForwardSwitches));
   child_command_line.AppendSwitchASCII(
       switches::kChildProcessType, base::IntToString(static_cast<int>(type_)));
 
   embedder::HandlePassingInformation handle_passing_info;
   platform_channel_pair_.PrepareToPassClientHandleToChildProcess(
       &child_command_line, &handle_passing_info);
 
   base::LaunchOptions options;
-#if defined(OS_WIN)
-  options.start_hidden = true;
-  options.handles_to_inherit = &handle_passing_info;
-#elif defined(OS_POSIX)
   options.fds_to_remap = &handle_passing_info;
-#endif
   child_process_ = base::LaunchProcess(child_command_line, options);
   if (!child_process_.IsValid())
     return false;
 
   platform_channel_pair_.ChildProcessLaunched();
   return true;
 }
 
 void ChildProcessHost::DidLaunch(bool success) {
   delegate_->DidStart(success);
 }
 
 }  // namespace shell
 }  // namespace mojo