[cleanup] Add recent cleanup cls to .git-blame-ignore-revs

Ensures three recent formatting cls are ignored by git blame:
- https://crrev.com/c/6438214
- https://crrev.com/c/6437107
- https://crrev.com/c/6437697

Adds this to an existing block in the file as it matches the block's
description.

Change-Id: I0416642b50dd266c984f12afbfe4232823d93a61
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6438088
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Alex Turner <alexmt@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1444180}

.git-blame-ignore-revs

@@ -764,6 +764,9 @@ f1d1b3f3bbd9344a9f58239fb87b623048ffe9c6
 47d904702010d2ee65faf7e82c2498e1e54c7528
 ba09f2bcae2bbab315c45476397e8714cad6360c
 7f02ef31690fe6d8680974ad47c264822a267277
+e35fe73629258971e9b6f843f2132ba14d45786b
+7a78ea20986da4c1283d6a3bfbe358d98cfdf5f7
+d9be13c29fbf8db79490ff1f28e037aeddc13cee
 
 # [cleanup] clang-format //ios
 720730f7c308391f7e943e5c19d043e4e88e0e01