Revert of Revert of clang/win: Fix a few warnings in targets not in chromium_builder_tests.

sandbox/win/sandbox_poc/pocdll/fs.cc

 // Copyright (c) 2006-2008 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/sandbox_poc/pocdll/exports.h"
 #include "sandbox/win/sandbox_poc/pocdll/utils.h"
 
 // This file contains the tests used to verify the security of the file system.
 
 // Tries to open a file and outputs the result.
 // "path" can contain environment variables.
 // "output" is the stream for the logging.
-void TryOpenFile(wchar_t *path, FILE *output) {
+void TryOpenFile(const wchar_t *path, FILE *output) {
   wchar_t path_expanded[MAX_PATH] = {0};
   DWORD size = ::ExpandEnvironmentStrings(path, path_expanded, MAX_PATH - 1);
   if (!size) {
     fprintf(output, "[ERROR] Cannot expand \"%S\". Error %d.\r\n", path,
             ::GetLastError());
   }
 
   HANDLE file;
   file = ::CreateFile(path_expanded,
                       GENERIC_READ,
@@ skipping 21 matching lines @@
   TryOpenFile(L"%SystemRoot%", output);
   TryOpenFile(L"%ProgramFiles%", output);
   TryOpenFile(L"%SystemRoot%\\System32", output);
   TryOpenFile(L"%SystemRoot%\\explorer.exe", output);
   TryOpenFile(L"%SystemRoot%\\Cursors\\arrow_i.cur", output);
   TryOpenFile(L"%AllUsersProfile%", output);
   TryOpenFile(L"%UserProfile%", output);
   TryOpenFile(L"%Temp%", output);
   TryOpenFile(L"%AppData%", output);
 }