Migrate some more code to ES6 (2).

Review Request #10400 — Created Feb. 8, 2019 and updated

david
Review Board
release-4.0.x
reviewboard

This change converts remaining non-test code in the newReviewRequest/
directory to ES6.

Ran js-tests.

Summary
Migrate some more code to ES6 (2).
Description From Last Updated

Col: 15 '$branch' is defined but never used.

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