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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: Icb1dc7f1911d6b3bce54fa8132d66fb0acf71be5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2145819
Commit-Queue: dpapad <dpapad@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758356}