Revert "[1/2]Navigation bar height/width"

This reverts commit 9cee698195d19e8685c2e4d5122369d0f84cd709.
Navigation bar custom height

Conflicts:
	core/java/android/provider/Settings.java
	policy/src/com/android/internal/policy/impl/PhoneWindowManager.java

Change-Id: I9ca00129929364bcbd7d6ea11b6d4220543303e4