remove 32bit linux builder doing test

chrome does not support 32bit linux, but sometimes we want to test with
32bit linux, so keep build only builder here.

Bug: 976504
Change-Id: I0d08af02ea917d5a9305c7a040c4eaee6ebfa9da
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1666834
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#670719}
7 files changed