Drop stm32mon from pie whitelist; no longer in build

BUG=chromium-os:35931
TEST=platform_ToolchainOptions still passes

Change-Id: I9e325ec22076d9009ba423db27d91caa562aa23c
Reviewed-on: https://gerrit.chromium.org/gerrit/39421
Commit-Ready: Jim Hebert <jimhebert@chromium.org>
Tested-by: Jim Hebert <jimhebert@chromium.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
diff --git a/client/site_tests/platform_ToolchainOptions/pie_whitelist b/client/site_tests/platform_ToolchainOptions/pie_whitelist
index 977a35a..1d52eea 100644
--- a/client/site_tests/platform_ToolchainOptions/pie_whitelist
+++ b/client/site_tests/platform_ToolchainOptions/pie_whitelist
@@ -11,7 +11,5 @@
 /usr/sbin/nscd
 /usr/sbin/rpcinfo
 /usr/sbin/vpd
-# crosbug.com/35931
-/usr/sbin/stm32mon
 # chrome-os-partner:15814
 /opt/google/talkplugin/GoogleTalkPlugin