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The WebAssembly web worker parses .size and .sizediff files, the JS web
worker parses .ndjson files. Previously, the web worker would be set on
pageload according to the load_url parameter, so if you loaded a .size
file and then uploaded a .ndjson to view, the viewer would crash.

This CL refreshes the web worker on each file upload.

Change-Id: I182ac524bfd7049ed178bd2c6784bb0282f0ee8e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1946858Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Jasper Chapman-Black <jaspercb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720656}