Revert of Remove newlib toolchains from chromium DEPS (patchset #1 id:1 of https://codereview.chromium.org/1675803003/ )
Revert of Remove newlib toolchains from chromium DEPS (patchset #1 id:1 of https://codereview.chromium.org/1675803003/ )

Reason for revert:
This broke nacl_integration when rolled into Chromium (and there's an infra bug whereby the trybots ignore the result of nacl_integration).

The failure was:

"Exception: Cannot find a toolchain for x86-64 in /mnt/data/b/build/slave/Linux_Tests/build/src/native_client/toolchain/linux_x86/nacl_x86_newlib:"

See https://build.chromium.org/p/chromium.linux/builders/Linux%20Tests/builds/37997/steps/nacl_integration/logs/stdio

The "nacl_x86_newlib" directory is still referenced in chrome/test/nacl_test_injection/buildbot_chrome_nacl_stage.py.

There have been multiple DEPS rolls since this was rolled in, so it's easier to revert and re-roll than to try to revert those DEPS rolls on the Chromium side.

Original issue's description:
> Remove newlib toolchains from chromium DEPS
>
> This change removes the old gcc newlib toolchains from
> the list of toolchains installed by chromium's runhooks.
> The nacl_core_sdk mode is only used by chromium so this
> change shouldn't effect the NaCl tree itself.
>
> This change should result in download time and space
> saving for chromium developers.
>
> BUG= https://bugs.chromium.org/p/nativeclient/issues/detail?id=4352
>
> Committed: https://chromium.googlesource.com/native_client/src/native_client/+/6bd4e03a7eabac870151ff8736cbe6f39ef6cf64

TBR=mcgrathr@chromium.org,bradnelson@chromium.org,sbc@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG= https://bugs.chromium.org/p/nativeclient/issues/detail?id=4352

Review URL: https://codereview.chromium.org/1694083002

sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client