Update proxy resolver and tests for V8 API changes. DO NOT MERGE. am: a75708abc6  -s ours am: 08362eefb7 am: 1823a9da9c am: 944f349a2a  -s ours am: a0db1a6d0a am: f44dd06844 am: d82bfc881b
am: ec7ed589ed

Change-Id: Ic24ff0d3a0bcc76ca3ad2417b2772bd949161fb7