Revert of Suppress -Wnonportable-include-path on clang tot bots

Revert of Suppress -Wnonportable-include-path on clang tot bots (patchset #2 id:20001 of https://codereview.chromium.org/2040533003/ )

Reason for revert:
The Clang warning was removed again in r271761.

Original issue's description:
> Suppress -Wnonportable-include-path on clang tot bots
>
> BUG=617318
> R=hans@chromium.org
>
> Committed: https://chromium.googlesource.com/chromium/src/+/2bc751024e4ddf3f50594abdbf3c54b77df84562

TBR=thakis@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=617318
Committed: https://crrev.com/2b359d2e5b4f7639055c9c6ff3ed39a03a2a3a0b
Cr-Commit-Position: refs/heads/master@{#398065}

[hans, 2016-06-06 16:36:20]

The CQ bit was checked by hans@chromium.org

[hans, 2016-06-06 16:36:20]

Created Revert of Suppress -Wnonportable-include-path on clang tot bots

[commit-bot: I haz the power, 2016-06-06 16:36:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2043813002/1

[commit-bot: I haz the power, 2016-06-06 18:12:41]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-06 18:14:37]

Description was changed from

==========
Revert of Suppress -Wnonportable-include-path on clang tot bots (patchset #2
id:20001 of https://codereview.chromium.org/2040533003/ )

Reason for revert:
The Clang warning was removed again in r271761.

Original issue's description:
> Suppress -Wnonportable-include-path on clang tot bots
> 
> BUG=617318
> R=hans@chromium.org
> 
> Committed:
https://chromium.googlesource.com/chromium/src/+/2bc751024e4ddf3f50594abdbf3c...

TBR=thakis@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=617318
==========

to

==========
Revert of Suppress -Wnonportable-include-path on clang tot bots (patchset #2
id:20001 of https://codereview.chromium.org/2040533003/ )

Reason for revert:
The Clang warning was removed again in r271761.

Original issue's description:
> Suppress -Wnonportable-include-path on clang tot bots
>
> BUG=617318
> R=hans@chromium.org
>
> Committed:
https://chromium.googlesource.com/chromium/src/+/2bc751024e4ddf3f50594abdbf3c...

TBR=thakis@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=617318

Committed: https://crrev.com/2b359d2e5b4f7639055c9c6ff3ed39a03a2a3a0b
Cr-Commit-Position: refs/heads/master@{#398065}
==========

[commit-bot: I haz the power, 2016-06-06 18:14:38]

Patchset 1 (id:??) landed as
https://crrev.com/2b359d2e5b4f7639055c9c6ff3ed39a03a2a3a0b
Cr-Commit-Position: refs/heads/master@{#398065}

[Nico, 2016-06-14 14:20:33]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/2069603002/ by thakis@chromium.org.

The reason for reverting is: Warning landed again upstream..