Move peerconnection.html (renamed) to webrtc github repo

The files are from a chromium checkout with commit: 406524c9684aec97509dfae881b8aa45273d0823 being latest (Tue Aug 26 01:33:08 2014 -0700).

"updated"
Files reside in http://src.chromium.org/chrome/trunk/src/chrome/test/data/webrtc/manual/ and are renamed as following:

constraints.html > ../content/manual-test-pages/constraints/index.html
constraints.js > ../content/manual-test-pages/constraints/js/main.js
stylesheet.css > ../content/manual-test-pages/css/stylesheet.css
multi-pc.html >../content/manual-test-pages/multiple-peerconnections/index.html
peerconnection-iframe.html >../content/manual-test-pages/peer2peer-iframe/index.html
peerconnection-help.html > ../content/manual-test-pages/peer2peer/help.html
peerconnection.html > ../content/manual-test-pages/peer2peer/index.html
peerconnection-manual.js > ../content/manual-test-pages/peer2peer/js/main.js

All files that use adapter.js have been updated to use the samples/web/js/adapter.js.