Linux: Depend on liberation-fonts package for RPMs.

Linux: Depend on liberation-fonts package for RPMs.

The previous try in r342645 was reverted because Fedora did not have a
liberation-fonts virtual package. Fedora has since added the missing
virtual pacakge per our request to supported distros - Fedora 21 and
newer.

So now we can fix the mismatch vs .debs, which added this dependency in
r342854.

BUG=369991
Committed: https://crrev.com/a6df68559fd91f3bf3273c5e46d1c6a7b2132b8c
Cr-Commit-Position: refs/heads/master@{#350101}

[Lei Zhang, 2015-09-22 01:50:40]

thestig@chromium.org changed reviewers:
+ mmoss@chromium.org

[Michael Moss, 2015-09-22 02:09:48]

lgtm

[Lei Zhang, 2015-09-22 02:12:27]

The CQ bit was checked by thestig@chromium.org

[commit-bot: I haz the power, 2015-09-22 02:12:59]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1358903005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1358903005/1

[commit-bot: I haz the power, 2015-09-22 03:28:44]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-22 03:29:34]

Patchset 1 (id:??) landed as
https://crrev.com/a6df68559fd91f3bf3273c5e46d1c6a7b2132b8c
Cr-Commit-Position: refs/heads/master@{#350101}

[Lei Zhang, 2015-09-29 05:54:15]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1380473002/ by thestig@chromium.org.

The reason for reverting is: Fedora 21 is still broken..