Copy upstream code as of Chromium 39d53

For libchrome r1075024 uprev, where base/base64.cc will use the new
function modp_b64_encode_data, change made in crrev.com/1074948.

BUG=None
TEST=emerge modp_b64

Change-Id: I4fefddd140d431ee6fca4d27ffa8199372e4bebb
Reviewed-on: https://chromium-review.googlesource.com/c/aosp/platform/external/modp_b64/+/4060326
Tested-by: Grace Cham <hscham@chromium.org>
Commit-Queue: Grace Cham <hscham@chromium.org>
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
2 files changed