Fix custom navbar for tablets

Change-Id: I25eb74c468aba5bef6f6128c2e6ee4b4e4b50daa

Conflicts:
	packages/SystemUI/res/drawable-hdpi/ic_sysbar_killtask.png
	packages/SystemUI/res/drawable-hdpi/ic_sysbar_menu_big.png
	packages/SystemUI/res/drawable-hdpi/ic_sysbar_null.png
	packages/SystemUI/res/drawable-hdpi/ic_sysbar_power.png
	packages/SystemUI/res/drawable-mdpi/ic_sysbar_killtask.png
	packages/SystemUI/res/drawable-mdpi/ic_sysbar_menu_big.png
	packages/SystemUI/res/drawable-mdpi/ic_sysbar_power.png
	packages/SystemUI/res/layout/navigation_bar.xml
	policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
remove external process reference from ContentProviderRecord
ContentProviderRecords is removed from provider map by activity manager service
when the process hosting the content providers terminates and this causes GC
to free the content provider records but the reference to external process
using the content provider isn't cleared. Fix is to clear the reference and
unlink for death notification.

Change-Id: I078048d4314baeb0a6e9d83273fe9dbd6c707db9
selectable text in gtalk

Change-Id: I9fe3634dfdc64cb37ece7f431d12845c164d639b