chore: roll libcc (electron#13974)

nornagon · codebytere · commit e4f4a1d9f906 · 2018-08-08T09:59:16.000-07:00
Picks up electron/libchromiumcontent#637
diff --git a/vendor/libchromiumcontent b/vendor/libchromiumcontent
@@ -1 +1 @@
-Subproject commit 284e6d6ef2f95fd6b6d11f9af235dd541a01ff23
+Subproject commit 028b0af83076cec898f4ebce208b7fadb715656e
