DO NOT MERGE: Revert: Freeup lock when IME is set inactive and unbound

Reason for revert:
Caused an unexpected regression Bug 144174015

Bug: 139806621
Bug: 144103599
Fix: 144174015
Test: Manually verified Bug 144174015 disappeared as follows
 1. Open Gmail then start composing an email
 2. Swipe up the home button to recents then re-launch Gmail
 3. Do the step 2 several times.
 4. Make sure that you can still type something on Gmail.
Change-Id: I04a77afea17f9d3eb05017fa00313fad4e48cd5c