DO NOT MERGE: Revert "Don't let IME window fit status bar"

This reverts commit 3cd31141.

Reason for revert: The CL causes the regression b/170474494
And it also makes status bar color incorrect while
FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS is cleared
Fix: 170474494

Change-Id: I26bed08456197721d07f2fab563be0c54e43efd2