useless trace() in adapater.js

[jerome etienne]

hi

adapter.js is supposed to be for external use. still it contains trace() a global function which doesnt seem relevant to 'abstracts away browser differences and spec changes.' https://bitbucket.org/webrtc/codelab/src/master/complete/step6/js/lib/adapter.js#cl-8

it may be a good idea to put it elsewhere.

[Sam Dutton]

Agree. General feeling is to get rid of it from adapter.js.

...and thanks for pointing this out!