Revert "Bump jschannel to 65356ba, add git sha to file"

    This reverts commit 4048c13b81507887920ce33dee829a6fcb6f91d0.

    jschannel is broken on IE8. Deferring the upstream/downstream fix process
    until next train.
Merge pull request #3742 from 6a68/issue_3740_revert_jschannel

Revert jschannel update