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This patch uses OffTheRecord profiles to implement
|Target.createBrowserContext| and |Target.diposeBrowserContext| methods
for non-headless mode.

R=dgozman
BUG=836272

Change-Id: Ibd8b33bd9c804b69f17ef9cf1283b8c4bfc405ac
Reviewed-on: https://chromium-review.googlesource.com/1023591
Commit-Queue: Andrey Lushnikov <lushnikov@chromium.org>
Reviewed-by: Stefan Kuhne <skuhne@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553323}