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

runtime/bin/file_linux.cc

Index: runtime/bin/file_linux.cc
diff --git a/runtime/bin/file_linux.cc b/runtime/bin/file_linux.cc
index e6b27f8ace515a8b1d2a4073c01be6e9005ada64..aeba5c836d82552ea3451462145d7d2a102737db 100644
--- a/runtime/bin/file_linux.cc
+++ b/runtime/bin/file_linux.cc
@@ -182,7 +182,7 @@ File* File::FileOpenW(const wchar_t* system_name, FileOpenMode mode) {
 }
 
 
-File* File::ScopedOpen(const char* name, FileOpenMode mode) {
+File* File::Open(const char* name, FileOpenMode mode) {
   // Report errors for non-regular files.
   struct stat64 st;
   if (TEMP_FAILURE_RETRY(stat64(name, &st)) == 0) {
@@ -220,12 +220,6 @@ File* File::ScopedOpen(const char* name, FileOpenMode mode) {
 }
 
 
-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));
 }