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Previously a gzipped_resource_file_map_source/header Grit output was used
to determine which component extension resources are gzipped. This is no
longer necessary.

This is in preparation of deleting gzipped_resource_file_map_source Grit
output completely.

Specifically:
 - Modify chrome_url_request_util.cc to use ResourceBundle::IsGzipped.
 - Remove ComponentExtensionResourceInfo struct and update all signatures,
   basically reverting a lot of the changes made at r627283, since
   they are no longer necessary.
 - Remove last usages of type="gzipped_resource_file_map_source" in grd
   files.

Bug: 961063
Change-Id: Ifc9d1535c96e4a168b3d45f3c831976e52c9444a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1601481Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Michael Spang <spang@chromium.org>
Reviewed-by: Darren Shen <shend@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#658652}