Update v8 to version 2.5.4.

BUG=none
TEST=none
TBR=ager@chromium.org

Review URL: http://codereview.chromium.org/4344002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@64892 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed