Revert 190016 "Reland libjingle.gyp refactoring change."

Revert 190016 "Reland libjingle.gyp refactoring change."

> Reland libjingle.gyp refactoring change.
> 
> Original description (from https://codereview.chromium.org/12457027/):
> Refactor libjingle and libpeerconnection targets.
> I'm moving most of the source files back to the libjingle target since the
> current splitting doesn't work for all targets that currently rely on libjingle.
>  The webrtc core libs are still only in the libpeerconnection target, and
> require the enable_webrtc gyp variable to be be set.
> 
> I'm also adding a gyp variable to the libjingle target to support dependency
> injection as is supported for libpeerconnection.
> 
> TBR=ronghuawu@chromium.org
> 
> Review URL: https://codereview.chromium.org/12967005

TBR=tommi@chromium.org
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=190021

[tommi (sloooow) - chröme, 2013-03-23 16:24:27]

Committed patchset #1 manually as r190021.