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This changes the paradigm on retrieving resources. Before, for these functions,
you needed to know whether your resources were compressed to know to call the
right function.

Now, we can call it without knowing if there is decompression under the covers.
This also allows others to use std::string return types for convenience, even
if they don't use compression.

TBR: trivial renaming outside of reviewed area
Bug: 1003433
Change-Id: I0200d083d4a2d8f8fef98591e9c2e4188488a471
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1874514
Commit-Queue: Sam Maier <smaier@chromium.org>
Reviewed-by: Dan Beam <dbeam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711469}