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Various hasPendingActivity() overrides weren't taking the state of the
ExecutionContext into account, only considering if event listeners were
registered. We're not interested in holding onto a script environment
after an execution context has been destroyed, so adjust the predicates
to return false if the ExecutionContext has been destructed.

The V8GCController wrapper visitors already check if hasPendingActivity()
implementations incorrectly return |true| when used inside of destroyed
ExecutionContexts, but that check is not handled by trace wrappers
(ActiveScriptWrappable.)

R=
BUG=

Review-Url: https://codereview.chromium.org/2571193002
Cr-Commit-Position: refs/heads/master@{#438787}