restoring local btoa and atob
restoring local btoa and atob


Former-commit-id: be657f75992ce9d472f8c7a10accae6642418db6 [formerly 5a65fef95e4214360110767aa6f2e795ff805034]
Former-commit-id: f85bff39c8d14a6c1e73b700a7b983fb0d1eccd9
romancow/Sugar,romancow/Sugar,andrewplummer/Sugar,andrewplummer/Sugar