Update V8 to version 3.23.12.

TBR=yangguo@chromium.org

Review URL: https://codereview.chromium.org/88193003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237345 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237346 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 237346