Remove unused strings

Remove unused strings left over from telephone/incall split.

(Change from original CL on master: don't modify any translation files.)

Bug:13242270
Change-Id: I8383644ca31e66aa43b184368606cc693583da22
(cherry picked from commit 2604a129668c69a283822e1b1d2eb70bb8ba0be5)
Merge tag 'android-4.4.3_r1' into HEAD

Android 4.4.3 release 1

Conflicts:
	res/values/array.xml
	res/values/dimens.xml
	res/values/strings.xml
	src/com/android/incallui/InCallActivity.java

Change-Id: Ib47882d1cbbb803779314ccfa2964e5ae301ea4b