[wrapper-tracing] Move WrapperVisitor to ScriptWrappableVisitor

Move contents of WrapperVisitor to ScriptWrappableVisitor. This is 
now possible after onion soup refactorings and should result in less
virtual calls.

Bug: 
Change-Id: I5a13f97a5e6aca55192bda3eff07c5c2b8470794
Reviewed-on: https://chromium-review.googlesource.com/617280
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#495098}
49 files changed