This is mainly needed for heap snapshots, as they consume significant
amounts of
memory on engine side, but I added support for CPU profiles deletion as
well.
The approach isn't ideal, as after deleting a profile, embedder will get
stale
pointers for previously retrieved nodes etc., but I don't want to introduce
a
full DOM-like ref counting scheme here.
This works OK for WebKit / DevTools, as DevTools UI never tries to access
nodes
of deleted profiles, and in console object, there is no possibility to clear
profiles.
http://codereview.chromium.org/6685084/
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