Revert "Allow back to be pressed while in incoming call screen"

This reverts commit bd9ccd501ebd83508dfe52121e0f4827cc6e1fa3.

Bug: 18742942
Change-Id: I8016ddae8addb56b4d6350748628fec351e6531a
1 file changed
tree: 8f197c3cbb8a2ff065b3b2528953e4acd7fc0b46
  1. proguard.flags
  2. res/
  3. src/