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This reverts commit 0e1e6eb3.

Reason for revert:
 - gzipped_resource_* Grit output no longer exists.
 - the feature added by this CL is not actually used.
 - if it ends up needed, an alternative exists (inspect gzip header)

Original change's description:
> Use cpp file map to unpack gzipped resources
>
> We can get gzipped flag from gzipped_resource_map_source or
> gzipped_resource_file_map_source and use it to unpack gzipped resources
> with unpack.py.
>
> Bug: 738243
> Change-Id: I1bf56126f702fa6efbd2b3e8806ade9bdf904d1f
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1518520
> Commit-Queue: Dmitry Guketlev <yavanosta@yandex-team.ru>
> Reviewed-by: Dan Beam <dbeam@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#640738}

TBR=dbeam@chromium.org,dpapad@chromium.org,aee@chromium.org,yavanosta@yandex-team.ru

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 961063
Change-Id: If5f277929127207d018e9da30b7b6714000db2ee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1612088
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659721}