Fix an implicit cast from int64 to double in the i18n extension
Fix an implicit cast from int64 to double in the i18n extension

On MSVS, this throws an error

BUG=v8:2745
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/18854002

git-svn-id: b158db1e4b4ab85d4c9e510fdef4b1e8c614b15b@15557 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh