Revert "Work around an issue with clang-include-cleaner."

This reverts commit 89a552a5a3bf508d02c50094528092fb387dc140.

Reason for revert: issue as been fixed (https://github.com/llvm/llvm-project/issues/110843)

Original change's description:
> Work around an issue with clang-include-cleaner.
>
> Problem has been reported here:
> https://github.com/llvm/llvm-project/issues/110843
>
> Change-Id: Iaa578a17a724a80ea350db1494229c5af4c454b3
> Bug: b/236227627
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/364463
> Reviewed-by: Harald Alvestrand <hta@webrtc.org>
> Commit-Queue: Jeremy Leconte <jleconte@webrtc.org>
> Cr-Commit-Position: refs/heads/main@{#43154}

Bug: b/236227627
Change-Id: I5e48300219e62bcd801dd4a49c94554828cce15e
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/381661
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Jeremy Leconte <jleconte@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#44160}
diff --git a/tools_webrtc/iwyu/apply-include-cleaner b/tools_webrtc/iwyu/apply-include-cleaner
index 6967bf4..a809e3b 100755
--- a/tools_webrtc/iwyu/apply-include-cleaner
+++ b/tools_webrtc/iwyu/apply-include-cleaner
@@ -107,11 +107,7 @@
 HAS_OUTPUT=false
 for FILE in "$@"
 do
-  # Run the command in $WORKDIR because of this reported issue:
-  # https://github.com/llvm/llvm-project/issues/110843
-  cd $WORKDIR
-  OUTPUT=$(../../$CLEANER $INCLUDE_ARGS $COMMAND ../../$FILE)
-  cd -
+  OUTPUT=$($CLEANER -p $WORKDIR $INCLUDE_ARGS $COMMAND $FILE)
 
   # include-cleaner does not support custom mappings for certain deps
   # this ensures that the gtest/gmock deps it inserts are replaced