Revert "Take the input device into account for meta state"

This reverts commit 8a1597b3. That
commit broke some of the handling of meta state, which in turn caused
CTS test failures, notably bug 10210151 (CTS:
android.text.method.cts.BaseKeyListenerTest#testBackspace_withSendKeys
is failing on KLP).

So this revert fixes those test failures, but leaves bug 8303489
(Pressing shift on the hardware keyboard messes with unrelated
keypresses, including virtual ones) still present. We'll plan to
address that in a future release.

Change-Id: Iea42c643b6d08f33cbd2ed1747e8de3b5f8116a6