Remove preemption thread and API

Remove preemption thread and API

BUG=v8:3004
R=svenpanne@chromium.org, yangguo@chromium.org
LOG=y

Committed: https://code.google.com/p/v8/source/detail?r=17967

[Sven Panne, 2013-11-14 10:13:16]

https://codereview.chromium.org/62283010/diff/1/include/v8.h
File include/v8.h (left):

https://codereview.chromium.org/62283010/diff/1/include/v8.h#oldcode5256
include/v8.h:5256: static void StartPreemption(Isolate* isolate, int
every_n_ms);
While I fully agree that we should remove most of this stuff, we are breaking
our API protocol here: We should deprecate these 2 API entries for 1 stable
release and remove it afterwards.

Is there a chance to get the deprecations into the release branch now? It
shouldn't be a problem when Chrome doesn't use it. Otherwise we should perhaps
wait for another release cycle.

[jochen (gone - plz use gerrit), 2013-11-18 10:23:19]

rebased, ptal

[Sven Panne, 2013-11-20 13:12:48]

LGTM. Chrome doesn't use the API, node.js's sources don't contain any calls to
it, and nobody complained on v8-users, so it should be safe to remove it.

[jochen (gone - plz use gerrit), 2013-11-21 13:47:47]

Committed patchset #2 manually as r17967 (presubmit successful).