GitLab

Now that all the tests have been migrated to the new integration test
framework, we can remove the remaining bits of the legacy framework.

There were a few references to inspector files in a handful of network
tests, which have been updated to their respective devtools' resources files.

Also found a (disabled) virtual test that slipped through the cracks:
virtual/threaded/http/tests/devtools/tracing/idle-callback.js

Bug: 667560
Change-Id: I2fddfee0af766c7f672bd118ff3fc75d23418d89
Reviewed-on: https://chromium-review.googlesource.com/828268Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Will Chen <chenwilliam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524533}