Bug 852847 - Part 4: Re-enable some browser-element tests.
WIP: Move procesprioritymanager to main process.
No bug - s/bool/booleans/ in an error message in xpidl.py. r=me
More WIP
WIP: It compiles now.
Make ProcessPriorityManager compile.
Adding incomplete test_priority_oop_Simple test.
More test fixes.
ProcessPriorityManager fixes.
Fix case of "unused.h".
Hopefully fix 64-bit builds.
Set network.disable.ipc.security to true and leave it that way.  This prevents security errors in the tests which happen when we pop the pref.
Adding comments to test_Simple.
Adding missing lock to browserElementTestHelpers.
Improving test_Simple.html comment.
Moving observer creation code into browserElementTestHelpers.
Moving process priority manager observer logic into browserElementTestHelpers.
Adding HighPriority test.
Adding delay tracking to the high-priority test.
Adding test_Background.