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This CL flips the default value of use_new_wrapper_types from "false" to "true".

BUG=624136
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_blink_rel

Review-Url: https://codereview.chromium.org/2156303003
Cr-Commit-Position: refs/heads/master@{#406224}