Revert "Add modulemap compatibility for ChromeOS by ensuring that linux-specific headers are textual."

This reverts commit 4f51c7a40be78bb615ae33d5872cb14be09f39d5.

Reason for revert:
LUCI Bisection has identified this change as the culprit of a build failure. See the analysis: https://ci.chromium.org/ui/p/chromium/bisection/compile-analysis/b/8704055731680973905

Sample failed build: https://ci.chromium.org/b/8704055731680973905

If this is a false positive, please report it at http://b.corp.google.com/createIssue?component=1199205&description=Analysis%3A+https%3A%2F%2Fchromium-review.googlesource.com%2Fc%2Fchromium%2Fsrc%2F%2B%2F6910803&format=PLAIN&priority=P3&title=Wrongly+blamed+https%3A%2F%2Fci.chromium.org%2Fui%2Fp%2Fchromium%2Fbisection%2Fcompile-analysis%2Fb%2F8704055731680973905&type=BUG

Original change's description:
> Add modulemap compatibility for ChromeOS by ensuring that linux-specific headers are textual.
>
> Bug: 442479236
> Change-Id: I6a6a69648f0e14ab0c0270b6f1163d81b3be3b8b
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6910803
> Commit-Queue: Matt Stark <msta@google.com>
> Auto-Submit: Matt Stark <msta@google.com>
> Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1514072}
>

Bug: 442479236
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Change-Id: Ida812b3a66ff7bd50284d3e8769467981e26e38b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6937702
Commit-Queue: luci-bisection@appspot.gserviceaccount.com <luci-bisection@appspot.gserviceaccount.com>
Owners-Override: luci-bisection@appspot.gserviceaccount.com <luci-bisection@appspot.gserviceaccount.com>
Bot-Commit: luci-bisection@appspot.gserviceaccount.com <luci-bisection@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1514081}