Version 3.28.71.12 (merged r24125)

Fix escaped index JSON parsing

BUG=416449
LOG=N
R=verwaest@google.com, verwaest@chromium.org

Review URL: https://codereview.chromium.org/597893002

git-svn-id: https://v8.googlecode.com/svn/branches/3.28@24162 ce2b1a6d-e550-0410-aec6-3dcde31c8c00