Loosen permission on extension temp dir when a flag is used.

base/file_util_posix.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/file_util.h"
 
 #include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <fnmatch.h>
@@ skipping 410 matching lines @@
   char* buffer = const_cast<char*>(sub_dir_string.c_str());
   char* dtemp = mkdtemp(buffer);
   if (!dtemp)
     return false;
   *new_dir = FilePath(dtemp);
   return true;
 }
 
 bool CreateTemporaryDirInDir(const FilePath& base_dir,
                              const FilePath::StringType& prefix,
+                             bool loosen_permissions,
                              FilePath* new_dir) {
+  // To understand crbug/35198, the ability to call this
+  // this function on windows while giving loose permissions
+  // to the resulting directory has been temporarily added.
+  // It should not be possible to call this function with
+  // loosen_permissions == true on non-windows platforms.
+  DCHECK(!loosen_permissions);
+
   FilePath::StringType mkdtemp_template = prefix;
   mkdtemp_template.append(FILE_PATH_LITERAL("XXXXXX"));
   return CreateTemporaryDirInDirImpl(base_dir, mkdtemp_template, new_dir);
 }
 
 bool CreateNewTempDirectory(const FilePath::StringType& prefix,
                             FilePath* new_temp_path) {
   FilePath tmpdir;
   if (!GetTempDir(&tmpdir))
     return false;
@@ skipping 389 matching lines @@
   if (HANDLE_EINTR(close(infile)) < 0)
     result = false;
   if (HANDLE_EINTR(close(outfile)) < 0)
     result = false;
 
   return result;
 }
 #endif  // defined(OS_MACOSX)
 
 } // namespace file_util