[Webapp Refactor] Implements Me2MeConnectFlow as an object.
This CL encapsulates Me2MeConnectFlow as an object.
Ultimately, we would like to create an interface to abstract
connection, error handling on the It2MeFlow and the Me2MeFlow
on the desktop remoting end.
Summary of changes:
1. Move pairingInfo into remoting.Host.
2. Update the field names of remoting.pairingInfo to match
storage keys.
3. Move code from crd_connect.js into Me2MeConnectFlow.
BUG=466406
Review URL: https://codereview.chromium.org/
1008003002
Cr-Commit-Position: refs/heads/master@{#320832}