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piex-wasm assumes chrome.runtime.reload can be used to reload the page
on Module failures. Other environments (normal web pages, web workers,
NodeJS, etc) obviously can't use chrome.runtime.reload.

Remove the chrome.runtime.reload assumption: change the client code to
provide the failure handler to piex-wasm. Change image_request_task.js
RAW image client code: pass in the chrome.runtime.reload handler.

While here, add or adjust comments to image_request_task.js and change
the direct loading case to arrow function. No change in behavior.

Bug: 1132695
No-try: true
Change-Id: I6a2b641cdc036dd208f4d64deb4f0b7fdff0835f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2432705
Commit-Queue: Noel Gordon <noel@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811085}