[Tizen] Add Tizen Murphy resource policy daemon integration

This patch includes Chromium side changes that are needed for
integrating WebMediaPlayer with the Murphy resource policy daemon.
Merge pull request #187 from nagineni/murphy_ivi_v2

[Tizen] Add Tizen Murphy resource policy daemon integration
[Tizen] Remove changes that were added to tag media role as "browser".

These changes are not needed anymore since the Murphy integration is in
place and we are setting media role for streams while creating Murphy
resource.