Revert of [Chromoting] Enable remoting webapp main.html GN build.

Revert of [Chromoting] Enable remoting webapp main.html GN build. (patchset #5 id:80001 of https://codereview.chromium.org/1082083005/)

Reason for revert:
Suspected of breaking the build.  For details, see https://code.google.com/p/chromium/issues/detail?id=477869

Original issue's description:
> [Chromoting] Enable remoting webapp main.html GN build.
>
> The previous remoting webapp GN build files were not enabled and at
> least 6 months out of date. This cl fixes the problem by bringing
> the build rules up to date and enables the webapp build.
>
> It also starts to move all the remoting-specific build rules into
> the remoting dir rather than having them in the main build.gn file.
>
> BUG=
>
> Committed: https://crrev.com/62ee8a9cfebbc8bdc037aaa3b37ebfbb45e02472
> Cr-Commit-Position: refs/heads/master@{#325551}

TBR=dpranke@chromium.org,garykac@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Committed: https://crrev.com/76302d920e57d6d0c368d827a78817aecea541ba
Cr-Commit-Position: refs/heads/master@{#325556}

[maniscalco, 2015-04-16 23:54:17]

Created Revert of [Chromoting] Enable remoting webapp main.html GN build.

[commit-bot: I haz the power, 2015-04-16 23:55:01]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1090023004/1

[commit-bot: I haz the power, 2015-04-16 23:57:51]

Committed patchset #1 (id:1)

[Dirk Pranke, 2015-04-16 23:58:34]

lgtm.

[commit-bot: I haz the power, 2015-04-16 23:59:42]

Patchset 1 (id:??) landed as
https://crrev.com/76302d920e57d6d0c368d827a78817aecea541ba
Cr-Commit-Position: refs/heads/master@{#325556}