Clean up navigation bar height & fix it

Change-Id: I03e6edf14014f8293bd82f6f313454ce4cd56139

Conflicts:
	policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
Revert "Clean up navigation bar height & fix it"

This reverts commit 353a9bee3e01487798d11535a3ae2a12cbb02e13.
Revert "Revert "Clean up navigation bar height & fix it""

This reverts commit 0fc6a50da8dc15f76e0941f8f2c3b40396cd9060.
Revert "Revert "Revert "Clean up navigation bar height & fix it"""

This reverts commit 13624e988c51957a37dd919fcaa09189051c25ed.
Revert "Revert "Revert "Revert "Clean up navigation bar height & fix it""""

This reverts commit afc666e060fee7f47a03b3e373e2a17878963b26.