Clean up a few more unused globals.

chrome/browser/extensions/api/messaging/native_process_launcher.cc

 // Copyright (c) 2012 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/extensions/api/messaging/native_process_launcher.h"
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/path_service.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "chrome/browser/extensions/api/messaging/native_messaging_host_manifest.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_switches.h"
 #include "content/public/browser/browser_thread.h"
 #include "url/gurl.h"
 
 namespace extensions {
 
 namespace {
 
+#if defined(OS_WIN)
 // Name of the command line switch used to pass handle of the native view to
 // the native messaging host.
 const char kParentWindowSwitchName[] = "parent-window";
+#endif  // defined(OS_WIN)
 
 base::FilePath GetHostManifestPathFromCommandLine(
     const std::string& native_host_name) {
   const std::string& value =
       CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
           switches::kNativeMessagingHosts);
   if (value.empty())
     return base::FilePath();
 
   std::vector<std::string> hosts;
@@ skipping 223 matching lines @@
 }  // namespace
 
 // static
 scoped_ptr<NativeProcessLauncher> NativeProcessLauncher::CreateDefault(
     gfx::NativeView native_view) {
   return scoped_ptr<NativeProcessLauncher>(
       new NativeProcessLauncherImpl(native_view));
 }
 
 }  // namespace extensions