Use MemoryCursor code in framework.

That way, we need to fix bugs only once.

Change-Id: Iae3df411462b7adc12aa09a5ea7ec6f01834ac0d
Merge tag 'android-4.3_r2.1' into cm-10.2

Android 4.3 release 2.1
Revert "contacts: Privacy Guard support"

This reverts commit 1fe9d602d1f9e5072cebe1ac8f1b3872bc8ff11a.