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This CL abstracts Me2Me and It2Me under one common interface
remoting.Activity.

Instead of littering desktop_remoting.js with if statements based on the
mode, all Me2Me specific logic can be moved into
remoting.Me2MeActivity and likewise for It2Me.

BUG=466406
NOTRY=true
TEST=All integration tests passed on chromoting bots.
https://chromium-swarm.appspot.com/user/task/26aed85d041d9d10

Review URL: https://codereview.chromium.org/1054273002

Cr-Commit-Position: refs/heads/master@{#324156}