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File Manager: Convert banners.js and location_line.js to ES6 class syntax.

This is in preparation of removing the custom cr.EventTarget implementation in
favor of native EventTarget, which requires all subclasses to be ES6 classes,
otherwise a runtime "Illegal invocation" error is thrown.

Bug: 854268,778674
Change-Id: Ice80144e128fb414d2d5d46d8b2a04a439d0dafe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1554280
Auto-Submit: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#648255}