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This file was previously auto-generated with a custom one-off python
script, which is no longer necessary now that generate_grd() exists.

The previously generated file was also unnecessarily using
|flattenhtml| and |allowexternalscript| Grit attributes which are
removed as part of using the new tool.

Besides the benefit of removing a one-off script, this also removes a
TODO about crbug.com/1112471 about making the one-off script work with
Python 3, which is now obsolete.

Bug: 1132403,1152343,1112471
Change-Id: I06928dcc2690b819eea1680fde23221ded94ed89
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2557349
Commit-Queue: dpapad <dpapad@chromium.org>
Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830647}