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A valid Cast device address must be private. This is checked using
the IPAddress::IsReserved() method, similar to DIAL's device description
service.

The check is performed in several entry points (some are redundant as
extra safety net):
- DnsSdRegistry, when it receives an device advertisement from mDNS
- CastSocketService, before it opens socket
- CastSocketServiceImpl::OpenChannel
- CastChannelOpenFunction (entry point for chrome.cast.channel.open)

Bug: 786109
Change-Id: Iaad91834cd4149fd345b2ada4e2704a0e158ba49
Reviewed-on: https://chromium-review.googlesource.com/792650
Commit-Queue: Derek Cheng <imcheng@chromium.org>
Reviewed-by: mark a. foltz <mfoltz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519857}