Reland "Temporarily disable EOL policy for .in files."

This reverts commit a7a78fe465b754c7698184053bfa2aa11a85cebd.

Reason for revert: There are still problems with .in files.
See https://crbug.com/pdfium/1302.

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

Bug: pdfium:1299,pdfium:1302
Change-Id: I7fbdab1d74a32c4a4137933675027e014dd16101
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/54671
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
diff --git a/.gitattributes b/.gitattributes
index c772c32..4c7b465 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -6,7 +6,8 @@
 *.gn text eol=lf
 *.gni text eol=lf
 *.h text eol=lf
-*.in text eol=lf
+# Temporarily disabled. https://crbug.com/pdfium/1299
+# *.in text eol=lf
 *.js text eol=lf
 *.md text eol=lf
 *.mm text eol=lf