Update to latest libchromiumcontent
Update to latest libchromiumcontent

* vendor/libchromiumcontent ccec3a4...a56056d (1):
  > Stop exporting GURL symbols from test_support_chromiumcontent

brave/brightray,lakshmi-srinivas/brightray,bbondy/brightray,tejaspathak/brightray,deepak1556/brightray,tejaspathak/brightray,atom/brightray,lakshmi-srinivas/brightray,lakshmi-srinivas/brightray,paulcbetts/brightray,hokein/brightray,brave/brightray,atom/brightray,hokein/brightray,paulcbetts/brightray,deepak1556/brightray,bbondy/brightray