clang plugin: Stop passing flags that are always-on.

No behavior change.

Bug: none
Change-Id: I5a59b69e4640a5144a86e9f3ce25508c5c265c19
Reviewed-on: https://chromium-review.googlesource.com/c/1388820
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#618722}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 4ad54958833875cffe92dcc69cbf836ae6e44fa5
1 file changed