Fix browser compatibility regressions in release-3.0.x.

Review Request #9063 - Created July 8, 2017 and submitted

Christian Hammond
Review Board
release-3.0.x
cd21929...
reviewboard

Some of the new features in Review Board 3.0 regressed support for some
slightly older browsers. There was a non-ES6 JavaScript file using
const, and an expectation that Blob was a valid type.

The const has been replaced with a var statement, and the Blob is
now checked as a valid type before use. This restores IE9 and some
mobile support.

Tested that IE9 no longer broke on page load.

Barret Rennie
David Trowbridge
Christian Hammond
Review request changed

Status: Closed (submitted)

Change Summary:

Pushed to release-3.0.x (ae1469b)
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