Move implementation files out of the webrtc/ root.

Leaves the root for public headers. Also fixes the issue of requiring
root OWNERS approval for changes in the Call implementation and adding
end-to-end tests.

BUG=
R=mflodman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/5049005

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5223 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/webrtc.gyp

@@ -59,9 +59,7 @@
       'target_name': 'webrtc',
       'type': 'static_library',
       'sources': [
-        'call.cc',
         'call.h',
-        'config.cc',
         'config.h',
         'experiments.h',
         'frame_callback.h',