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Before this CL, the only way to include generated files
in a generated grd file was to use |manifest_files| as input to
generated_grd(), forcing us to use preprocess_grit() even when not
necessary. With this CL, |input_files| can hold generated files
directly.

Bug: 1132403
Change-Id: I6f71458387b3c3cb2284019787f8836326c31b7e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2537595
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Auto-Submit: dpapad <dpapad@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827408}