This change is mostly straightforward, except for the following.
- It removes all the printing from the do_check_* macros because gtest macros
do appropriate printing.
- test_StatementCache.cpp needs some special gtest magic for the type
parameterization.
- It merges the four tests in test_unlock_notify.cpp because they rely on being
executed in order, and so aren't independent.
- storage_test_harness_tail.h is no longer necessary because gtest provides the
test looping functionality.
- It uses #include and the preprocessor to remove the duplication between
test_deadlock_detector.cpp and xpcom/tests/DeadlockDetector.cpp.
- It makes the test in test_service_init_background_thread.cpp a death test to
force it to be the first storage gtest, because it fails otherwise.
- It adds code to undo the SQLite mutex hooking as necessary, so that tests
don't interfere with each other.
- It de-virtualizes Spinner's destructor (as identified in bug 1318282).
