Disarm LockToOrigin for extensions under --isolate-extensions.
--isolate-extensions actually permits render process reuse, unlike
--site-per-process. This means that "one extension per process" isn't a
valid thing to enforce, which hopefully explains the process kills
we have seen in the wild.
Add a test that exercises this. It fails without the fix.
BUG=600441
TEST=browser_tests
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_site_isolation
Review URL: https://codereview.chromium.org/1867683002
Cr-Commit-Position: refs/heads/master@{#385947}
2 files changed
