build: Remove remoteexec_defaults.gni

Since Reclient is being removed from Chromium repo,
`use_reclient_on_siso` shouldn't be allowed anymore.

This CL needs to be submitted after https://crrev.com/c/7099239 got
merged to depot_tools.

Bug: 379584977
Change-Id: I35867974114fb7917699ef1abd34ecc6c87e789d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7099418
Reviewed-by: Fumitoshi Ukai <[email protected]>
Commit-Queue: Junji Watanabe <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1541316}
NOKEYCHECK=True
GitOrigin-RevId: 41f9db0429eead743a6f52c5d2a25bb8ead4dead
2 files changed