Revert "Disable git EOL policy for .in files again."

This reverts commit 46a045eaf1e18226b6e5207f6fb383327f2750d8.

Reason for revert: Underlying problem should be resolved.

Original change's description:
> Disable git EOL policy for .in files again.
> 
> The bug is manifesting on try bots.
> 
> Bug: pdfium:1302
> TBR=npm@chromium.org
> Change-Id: If71b17e25f32786fe54554156262838d61ac9a4d
> Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/60573
> Reviewed-by: Lei Zhang <thestig@chromium.org>
> Commit-Queue: Lei Zhang <thestig@chromium.org>

TBR=thestig@chromium.org,npm@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: pdfium:1302
Change-Id: Id764baafd3aadd25ecd8a5bbfd5c5c92d2f910ad
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/61010
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
diff --git a/.gitattributes b/.gitattributes
index 5d75502..c772c32 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -6,8 +6,7 @@
 *.gn text eol=lf
 *.gni text eol=lf
 *.h text eol=lf
-# Temporarily disabled. https://crbug.com/pdfium/1302
-# *.in text eol=lf
+*.in text eol=lf
 *.js text eol=lf
 *.md text eol=lf
 *.mm text eol=lf