Revert of Sandbox html_viewer on Linux.

Revert of Sandbox html_viewer on Linux. (patchset #6 id:100001 of https://codereview.chromium.org/1274743004/ )

Reason for revert:
Doesn't build on the Linux GN bot: http://build.chromium.org/p/chromium.linux/builders/Linux%20GN/builds/30188/steps/compile/logs/stdio

Original issue's description:
> Sandbox html_viewer on Linux.
>
> This creates a font_service which does the same role as
> font_config_ipc_linux.cc does in content/. This lets us sandbox the
> html_viewer, while still being able to communicate with fontconfig.
>
> Also prewarms the ICU timezone data, along with doing all the
> prewarming that's done in the core_services sandbox.
>
> BUG=492524
> NOPRESUBMIT=true
>
> Committed: https://crrev.com/4196dfefc131b0a77a3e02e917b852dba8faf445
> Cr-Commit-Position: refs/heads/master@{#342281}

TBR=jam@chromium.org,erg@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=492524
Committed: https://crrev.com/0001770c500d61c7369860cfef9353576dd30a3b
Cr-Commit-Position: refs/heads/master@{#342286}

[Nico, 2015-08-07 04:49:34]

Created Revert of Sandbox html_viewer on Linux.

[commit-bot: I haz the power, 2015-08-07 04:49:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1276163002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1276163002/1

[commit-bot: I haz the power, 2015-08-07 04:51:03]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-08-07 04:51:28]

Patchset 1 (id:??) landed as
https://crrev.com/0001770c500d61c7369860cfef9353576dd30a3b
Cr-Commit-Position: refs/heads/master@{#342286}