Revert 'Introduce phantom weak handles in the API and use them internally for debug info'

Revert 'Introduce phantom weak handles in the API and use them internally for debug info'

Revert of https://codereview.chromium.org/649563006/ due to layout test
failures.
BUG=
R=mstarzinger@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=24901

[Michael Starzinger, 2014-10-27 12:02:10]

mstarzinger@chromium.org changed reviewers:
+ mstarzinger@chromium.org

[Michael Starzinger, 2014-10-27 12:02:11]

LGTM (rubber-stamped).

[Erik Corry Chromium.org, 2014-10-27 12:03:36]

Committed patchset #1 (id:1) manually as 24901 (presubmit successful).