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GetRawDataResource assumes that underlying files are not compressed,
whereas LoadDataResourceString automatically decompresses if necessary.

This is one of many CLs, in preparation of compressing all HTML, JS,
CSS, SVG files by default (meaning without requiring compress="gzip"
to be specified).

Bug: 1068407
Change-Id: I1605422bd71e8712547ab93a29dff20e2f54c5f0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2144457Reviewed-by: Esmael Elmoslimany <aee@chromium.org>
Commit-Queue: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758318}