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The patch uses Node::isConnected() and Document::IsContextDestroyed()
predicates to compute whether a Node is detached or not. This information
is then propagated to all ScriptWrappables.

DevTools shows detached nodes with the "Detached" prefix. For example,
"Detached HTMLDocument" or "Detached Window".

Bug: 811925
Change-Id: Ib7987f578cc513b6bdfcfe084c885cbff84a4dba
Reviewed-on: https://chromium-review.googlesource.com/961401
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Alexei Filippov <alph@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543382}