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This reverts commit 448e1b37.

Reason for revert: Breaks translation, crbug.com/1141934

Original change's description:
> WebUI: Add support for producing/consuming grdp files in generate_grd.py
>
> This will be leveraged in follow up CLs, to auto-generate parts of
> webui_resources.grd.
>
> Bug: 1132403
> Change-Id: I5bd5f8a411c2cbc1f023220a779d74be209e902c
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2489920
> Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
> Commit-Queue: dpapad <dpapad@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#820148}

TBR=dpapad@chromium.org,rbpotter@chromium.org

Change-Id: Ie0e71ef0d9a7dd8bbe5c0da452692b3e9c3f96db
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1132403
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2495518Reviewed-by: Krishna Govind <govind@chromium.org>
Commit-Queue: Krishna Govind <govind@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820344}