build: Bump libcc to latest (electron#13821)

poiru · ckerr · commit acbabc7635f2 · 2018-07-26T08:26:08.000-07:00
This picks up electron/libchromiumcontent#617.
diff --git a/vendor/libchromiumcontent b/vendor/libchromiumcontent
@@ -1 +1 @@
-Subproject commit c2548454a768a671caae97b0e2d389f72aafdc97
+Subproject commit ca55cd0d8f7e7eccdefa49f82fcb6ef3789a230b
