Fix clang -Wwritable-strings warnings in the Windows sandbox

sandbox/win/src/job.h

Index: sandbox/win/src/job.h
diff --git a/sandbox/win/src/job.h b/sandbox/win/src/job.h
index 487722f0bb2e4518d8a6abb2268a7736fbd035f2..7c215efc8e63f87e97bb12fa7916437c44602d9c 100644
--- a/sandbox/win/src/job.h
+++ b/sandbox/win/src/job.h
@@ -29,7 +29,9 @@ class Job {
   // If the function succeeds, the return value is ERROR_SUCCESS. If the
   // function fails, the return value is the win32 error code corresponding to
   // the error.
-  DWORD Init(JobLevel security_level, wchar_t *job_name, DWORD ui_exceptions);
+  DWORD Init(JobLevel security_level,
+             const wchar_t* job_name,
+             DWORD ui_exceptions);
 
   // Assigns the process referenced by process_handle to the job.
   // If the function succeeds, the return value is ERROR_SUCCESS. If the