Remove unused libpeerconnection code.

Remove unused libpeerconnection code.
This removes boilerplate code that was used when we supported building libpeerconnection as a shared library.  We don't support that any longer, so it's safe to delete.

BUG=463660
Committed: https://crrev.com/de10703ec87eaa04f36f61697cc73e15bcf7d4cc
Cr-Commit-Position: refs/heads/master@{#330783}

[tommi (sloooow) - chröme, 2015-05-20 15:27:43]

tommi@chromium.org changed reviewers:
+ kjellander@chromium.org

[kjellander_chromium, 2015-05-20 16:02:05]

hmm, I'm going to let you work out the compilation errors first.

[tommi (sloooow) - chröme, 2015-05-20 16:28:26]

revert a couple of libjingle.gyp changes

[tommi (sloooow) - chröme, 2015-05-20 16:30:39]

On 2015/05/20 at 16:28:26, tommi wrote:
> revert a couple of libjingle.gyp changes

I reverted the LIBPEERCONNECTION_LIB change since there's still code in webrtc
that uses it.

[kjellander_chromium, 2015-05-20 17:29:22]

lgtm

[tommi (sloooow) - chröme, 2015-05-20 19:23:34]

The CQ bit was checked by tommi@chromium.org

[commit-bot: I haz the power, 2015-05-20 19:24:37]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1146123002/20001

[commit-bot: I haz the power, 2015-05-20 19:36:52]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-05-20 19:37:41]

Patchset 2 (id:??) landed as
https://crrev.com/de10703ec87eaa04f36f61697cc73e15bcf7d4cc
Cr-Commit-Position: refs/heads/master@{#330783}