Revert of [Chromoting] Add GN build support for ar_sample_app target.

Revert of [Chromoting] Add GN build support for ar_sample_app target. (patchset #1 id:1 of https://codereview.chromium.org/1135933002/)

Reason for revert:
Broke GN bots, eg.:
http://build.chromium.org/p/chromium.linux/builders/Linux%20GN/builds/28281

Original issue's description:
> [Chromoting] Add GN build support for ar_sample_app target.
>
> This adds GN build rules for the AppRemoting sample app.
> Some DesktopRemoting build rules were prettified as part of this
> process (to make the App- and Desktop- remoting build rules more
> similar).
>
> This re-lands crrev.com/1126393002 without any additional changes
> required. The issues with the GN clobber builds are fixed in
> crrev.com/1137753002.
>
> BUG=471916
>
> Committed: https://crrev.com/581797d8f76d5855b7f0bed1fe912a038d1d7d25
> Cr-Commit-Position: refs/heads/master@{#329206}

TBR=jamiewalch@chromium.org,garykac@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=471916
Committed: https://crrev.com/0374f266283d285a5a5925d43c4f07074e3a5b65
Cr-Commit-Position: refs/heads/master@{#329228}

[msw, 2015-05-11 20:21:26]

Created Revert of [Chromoting] Add GN build support for ar_sample_app target.

[Dirk Pranke, 2015-05-11 20:21:56]

dpranke@chromium.org changed reviewers:
+ dpranke@chromium.org

[Dirk Pranke, 2015-05-11 20:21:57]

lgtm

[commit-bot: I haz the power, 2015-05-11 20:22:14]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1136673003/1

[commit-bot: I haz the power, 2015-05-11 20:23:55]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-11 20:24:41]

Patchset 1 (id:??) landed as
https://crrev.com/0374f266283d285a5a5925d43c4f07074e3a5b65
Cr-Commit-Position: refs/heads/master@{#329228}