Revert 189802 "Refactor libjingle and libpeerconnection targets."

Revert 189802 "Refactor libjingle and libpeerconnection targets."
For some reason the "Linux Builder (dbg)(32)" bot is failing (and not other linux bots):

lib/libsync.so: undefined reference to `cricket::WebRtcVideoEngine::~WebRtcVideoEngine()'
lib/libsync.so: undefined reference to `cricket::WebRtcVideoEngine::GetVideoCapturer() const'
lib/libsync.so: undefined reference to `cricket::WebRtcVoiceEngine::RegisterProcessor(unsigned int, cricket::VoiceProcessor*, cricket::MediaProcessorDirection)'
lib/libsync.so: undefined reference to `cricket::WebRtcVideoEngine::SetOptions(int)'
lib/libsync.so: undefined reference to `cricket::WebRtcVideoEngine::Terminate()
...etc

> 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=darin
> 
> Review URL: https://codereview.chromium.org/12457027

TBR=tommi@chromium.org
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=189806

[tommi (sloooow) - chröme, 2013-03-22 14:22:06]

Committed patchset #1 manually as r189806.