[windows] Make most file_win.cc functions use malloc for string conversions.

runtime/bin/file_fuchsia.cc

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/globals.h"
 #if defined(TARGET_OS_FUCHSIA)
 
 #include "bin/file.h"
 
 #include <errno.h>  // NOLINT
@@ skipping 146 matching lines @@
   return -1;
 }
 
 
 File* File::FileOpenW(const wchar_t* system_name, FileOpenMode mode) {
   UNREACHABLE();
   return NULL;
 }
 
 
-File* File::ScopedOpen(const char* name, FileOpenMode mode) {
+File* File::Open(const char* name, FileOpenMode mode) {
   // Report errors for non-regular files.
   struct stat st;
   if (NO_RETRY_EXPECTED(stat(name, &st)) == 0) {
     if (!S_ISREG(st.st_mode)) {
       errno = (S_ISDIR(st.st_mode)) ? EISDIR : ENOENT;
       return NULL;
     }
   }
   int flags = O_RDONLY;
   if ((mode & kWrite) != 0) {
@@ skipping 16 matching lines @@
       (((mode & kWriteOnly) != 0) && ((mode & kTruncate) == 0))) {
     int64_t position = lseek(fd, 0, SEEK_END);
     if (position < 0) {
       return NULL;
     }
   }
   return new File(new FileHandle(fd));
 }
 
 
-File* File::Open(const char* path, FileOpenMode mode) {
-  // ScopedOpen doesn't actually need a scope.
-  return ScopedOpen(path, mode);
-}
-
-
 File* File::OpenStdio(int fd) {
   return ((fd < 0) || (2 < fd)) ? NULL : new File(new FileHandle(fd));
 }
 
 
 bool File::Exists(const char* name) {
   struct stat st;
   if (NO_RETRY_EXPECTED(stat(name, &st)) == 0) {
     return S_ISREG(st.st_mode);
   } else {
@@ skipping 223 matching lines @@
   return ((file_1_info.st_ino == file_2_info.st_ino) &&
           (file_1_info.st_dev == file_2_info.st_dev)) ?
       File::kIdentical :
       File::kDifferent;
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_FUCHSIA)