[SysApps] Fixed unit test crashing

Make sure the content:: path provider is registered. We need to test
first to make sure we are not registering it twice, otherwise the second
test to register the path provider will crash.

Also add the proper dependencies on the build system.
Merge pull request #1456 from tmpsantos/sysapps_utest_fix

[SysApps] Fixed unit test crashing