CommandLine: deprecate another function on non-Windows

base/command_line.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 "base/command_line.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #include <shellapi.h>
 #elif defined(OS_POSIX)
@@ skipping 314 matching lines @@
       switches_.find(lowercased_switch);
 
   if (result == switches_.end()) {
     return CommandLine::StringType();
   } else {
     return result->second;
   }
 }
 
 FilePath CommandLine::GetProgram() const {
-  return FilePath::FromWStringHack(program());
+#if defined(OS_WIN)
+  return FilePath(program_);
+#else
+  DCHECK_GT(argv_.size(), 0U);
+  return FilePath(argv_[0]);
+#endif
 }
 
 #if defined(OS_WIN)
 std::wstring CommandLine::program() const {
   return program_;
 }
-#else
-std::wstring CommandLine::program() const {
-  DCHECK_GT(argv_.size(), 0U);
-  return base::SysNativeMBToWide(argv_[0]);
-}
 #endif
 
 #if defined(OS_POSIX)
 std::string CommandLine::command_line_string() const {
   return JoinString(argv_, ' ');
 }
 #endif
 
 #if defined(OS_WIN)
 void CommandLine::AppendSwitch(const std::string& switch_string) {
@@ skipping 171 matching lines @@
 
 // private
 CommandLine::CommandLine() {
 }
 
 // static
 CommandLine* CommandLine::ForCurrentProcessMutable() {
   DCHECK(current_process_commandline_);
   return current_process_commandline_;
 }