Revert of Add Unicode Variation Selector support on Linux official builds

Revert of Add Unicode Variation Selector support on Linux official builds (patchset #1 id:1 of https://codereview.chromium.org/1283923002/ )

Reason for revert:
This CL prevents building official Chrome images on Linux.

../../third_party/WebKit/Source/platform/fonts/shaping/HarfBuzzFace.cpp:176:13: error: use of undeclared identifier 'hb_ot_font_set_funcs'

The proposed workaround doesn't work, so reverting this CL.

Original issue's description:
> Add Unicode Variation Selector support on Linux official builds
> 
> Most of the work to support Unicode Variation Selector was done in a
> separate CL[1], but it was not enabled for Linux due to crbug.com/462689.
> 
> This patch enables the Unicode Variation Selector support on Linux
> official builds.
> 
> The CL to enable on all Linux[2] was reverted because chromeos=1 is still
> bound to the harfbuzz in the system and thus unable to use
> hb_ot_font_set_funcs() on Trusty.
> 
> [1] https://codereview.chromium.org/1149693002/
> [2] https://codereview.chromium.org/1209043010/
> 
> BUG=383580
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=200427

TBR=eae@chromium.org,drott@chromium.org,kojii@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=383580
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=200747

[rsadam, 2015-08-18 19:45:17]

Created Revert of Add Unicode Variation Selector support on Linux official
builds

[commit-bot: I haz the power, 2015-08-18 19:45:31]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1292583006/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1292583006/1

[commit-bot: I haz the power, 2015-08-18 19:45:58]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=200747

[kojii, 2015-08-19 01:38:37]

On 2015/08/18 19:45:58, commit-bot: I haz the power wrote:
> Committed patchset #1 (id:1) as
> https://src.chromium.org/viewvc/blink?view=rev&revision=200747

LGTM, sorry for the trouble.