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Previously the code assumed, via the usage of
l10n_util::GetStringUTF16, that the underlying resources at
chrome/test/data/webui_test_resources.grd are not compressed.

Moreover, using l10n_util::GetStringUTF16() is not designed for fetching
a file's content and was somewhat misused here.

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: I77fe0f9966f6e277288838c42260433c34bd403c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2146090
Auto-Submit: dpapad <dpapad@chromium.org>
Commit-Queue: Ken Rockot <rockot@google.com>
Reviewed-by: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#758538}