Replace wstring with string16 in sandbox

sandbox/win/src/Wow64.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 "sandbox/win/src/wow64.h"
 
 #include <sstream>
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 124 matching lines @@
   // The 32 bit version is available, cleanup the child.
   return Restore64Code(child_->Process(), patch_info);
 }
 
 bool Wow64::RunWowHelper(void* buffer) {
   COMPILE_ASSERT(sizeof(buffer) <= sizeof(DWORD), unsupported_64_bits);
 
   // Get the path to the helper (beside the exe).
   wchar_t prog_name[MAX_PATH];
   GetModuleFileNameW(NULL, prog_name, MAX_PATH);
-  std::wstring path(prog_name);
+  base::string16 path(prog_name);
   size_t name_pos = path.find_last_of(L"\\");
-  if (std::wstring::npos == name_pos)
+  if (base::string16::npos == name_pos)
     return false;
   path.resize(name_pos + 1);
 
-  std::wstringstream command;
+  std::basic_stringstream<base::char16> command;
   command << std::hex << std::showbase << L"\"" << path <<
                L"wow_helper.exe\" " << child_->ProcessId() << " " <<
                bit_cast<ULONG>(buffer);
 
   scoped_ptr_malloc<wchar_t> writable_command(_wcsdup(command.str().c_str()));
 
   STARTUPINFO startup_info = {0};
   startup_info.cb = sizeof(startup_info);
   PROCESS_INFORMATION temp_process_info = {};
   if (!::CreateProcess(NULL, writable_command.get(), NULL, NULL, FALSE, 0, NULL,
@@ skipping 49 matching lines @@
   SIZE_T read;
   if (!::ReadProcessMemory(child_->Process(), ntdll_, &buffer, kBufferSize,
                            &read))
     return false;
   if (kBufferSize != read)
     return false;
   return true;
 }
 
 }  // namespace sandbox