Remove _DIRECT_LOAD_COMPLETE events in tests.

As described in b/211669337, these are causing flakes because the event
seems to fire twice as often in our configuration that has app
prediction service enabled. I don't know why it's flaking instead of
failing consistently, and I don't know whether the test is wrong or if
there's a bug in the code itself. Either way, this should give us
reliable success until we can figure it out, and it seems better than
disabling these tests entirely.

Bug: 211669337
Test: `atest ChooserActivityTest`
Change-Id: I8601886ae9610fbf7356e253b578c619b72f4570