[Auto-roll] Bump up version to 3.29.15.0

TBR=machenbach@chromium.org

Review URL: https://codereview.chromium.org/498663003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23303 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Revert "Add finalize sweeping event to GCIdleTimeHandler."

This reverts r23302.

TBR=hpayer@chromium.org

Review URL: https://codereview.chromium.org/500483002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23304 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Rewrite StoreIC handling using the LookupIterator. Continued from patch 494153002

BUG=
R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/478043006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23305 ce2b1a6d-e550-0410-aec6-3dcde31c8c00