buffet: Use Transport::CreateDefault() to create curl http transport

Using chromeos::http::Transport::CreateDefault() instead of
explicitly creating chromeos::http::curl::Transport.

BUG=None
TEST=FEATURES=test emerge-link buffet

Change-Id: I2b7300f404d2cbeecc45960031eb266dea1afe35
Reviewed-on: https://chromium-review.googlesource.com/216476
Tested-by: Alex Vakulenko <avakulenko@chromium.org>
Reviewed-by: Christopher Wiley <wiley@chromium.org>
Commit-Queue: Alex Vakulenko <avakulenko@chromium.org>
1 file changed
tree: a27a85ea0fbfbee4ca017ad37ef68e6087e1d2f4
  1. buffet/