Revert of Revert r261523 "Update V8 to version 3.26.5 (based on bleeding_edge revisio...

Revert of Revert r261523 "Update V8 to version 3.26.5 (based on bleeding_edge revision r20452)." (https://codereview.chromium.org/225243002/)

Reason for revert:
const.html needs a rebaseline, momentum-reset.html contains illegal javascript. i'll fix both

Original issue's description:
> Revert r261523 "Update V8 to version 3.26.5 (based on bleeding_edge revision r20452)."
>
> Breaks two tests upstream: http://test-results.appspot.com/dashboards/flakiness_dashboard.html#group=%40ToT%20Blink&tests=fast/js/const.html,rubberbanding/momentum-reset.html
>
> const.html is likely a revert, but momentum-reset.html points to a potential problem.
>
> TBR=
> BUG=
>
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=261670

TBR=nick@chromium.org,pfeldman@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=

Review URL: https://codereview.chromium.org/225373002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@261693 0039d316-1c4b-4281-b951-d872f2087c98