Don't leak file names in Windows File::Stat().

runtime/bin/file_win.cc

Index: runtime/bin/file_win.cc
diff --git a/runtime/bin/file_win.cc b/runtime/bin/file_win.cc
index b43ae0c772334a51ae66b2a39123d0514644fcd9..f4be3498f6f281ca685d6cca6072b10f41658670 100644
--- a/runtime/bin/file_win.cc
+++ b/runtime/bin/file_win.cc
@@ -468,6 +468,7 @@ void File::Stat(const char* name, int64_t* data) {
     struct _stat64 st;
     const wchar_t* system_name = StringUtils::Utf8ToWide(name);
     int stat_status = _wstat64(system_name, &st);
+    free(const_cast<wchar_t*>(system_name));
     if (stat_status == 0) {
       data[kCreatedTime] = st.st_ctime;
       data[kModifiedTime] = st.st_mtime;