Bump SDK version in html5 lib. We have a bunch of deprecation warnings, but
tests are still passing (will do the other changes in a separate CL).

Review URL: https://chromiumcodereview.appspot.com//12225119
Switch away from deprecated string API (next SDK). This is not working yet, but
putting it up so we can chat about it.

Review URL: https://chromiumcodereview.appspot.com//12224098
merge html5lib