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This is a reland of ac880b3a

Switched to using
ChromeDevToolsManagerDelegate::GetDefaultBrowserContext() which
outlives TCPDeviceProvider. The original was reverted because of a
crash when TCPDeviceProvider tried to access a destroyed
BrowserContext, see http://crbug.com/879060.

Original change's description:
> Convert tcp_device_provider.cc to mojo host resolver
>
> Bug: 874653
> Change-Id: I95b968427344a4c9821c0985ae1f89c153036bcd
> Reviewed-on: https://chromium-review.googlesource.com/1185626
> Commit-Queue: Clark DuVall <cduvall@chromium.org>
> Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#586738}

Bug: 874653
Change-Id: Ia6c00ba51020473f820add8c4257f3bf16fd5b24
Reviewed-on: https://chromium-review.googlesource.com/1197265Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587750}