Since webkit_unit_tests are not running v8 on multiple threads, there is no need to use v8::Locker class.
The problem with using it once is that every other test that runs late in the same process has to acquire a v8 lock too. Tests normally do not do that so they fail, especially on randomized runs.
This will make the patch in bug 58096 not needed.
Created attachment 88751 [details]