This test tries to remove profile by rmtree. However, since the "\\?\" prefix
has been applied to QM and its clients on Windows and thus they are able to
create files which exceed the MAX_PATH limitation.
Therefore, we need to prepend the prefix to the remove function in this test as
well.
Note that the problem was caused by an extension that uses IDB which was not
able to create a directory for stored files. The test doesn't check IDB so it
always passed before, despite the IDB failure. However, preceding patches make
it possible to use long file names in QM and QM clients, so IDB implementation
is now able to create the directory and the test needs to be able to delete it
as well.
Depends on D67875
Differential Revision: https://phabricator.services.mozilla.com/D67876
7cff71e1e3