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Part 2 affects CrOS only files.

The |flattenhtml| property of grd file entries is considered deprecated
and new usages of it are discouraged. Removing unnecessary usages,
both to:
 - discourage copy/paste usage
 - reveal which files actually still rely on it

The files that don't need it were detected by locally modifying Grit,
to compare the file contents before and after flattenhtml is applied.

In this CL only affecting files that don't need flattenhtml=true nor
preprcosses=true. Cases where |flattenhtml| can be removed, but
|preprocess| is still needed will be addressed in a follow-up.

Bug: 1152343
Change-Id: Ic2b8476d09a53a1cfc650dc5001526bc5ceb6c48
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2556494
Commit-Queue: dpapad <dpapad@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Auto-Submit: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#831179}