HALO: Fix memory leaks
framework: Privacy Guard

 * Introduce a new privacy feature which allows the user to run an
   application with reduced visibility into his or her personal data.
 * Adds a per-application flag and simple API to determine if this flag
   is enabled for the current or calling process.
 * This flag can be used by content providers to decide if they should
   return a limited/empty dataset.

Change-Id: Id7c54d728e63acb2b02a2a9322930b54949f6c5d
Add missing @hide annotations for Privacy Guard

Change-Id: I6072ed2d3ac05382f9cabbada0c42cea6cbe2422
privacy guard: Use LocationBlacklist for location filtering

 * Google has built a per-package blacklist into the location service.
 * Let's use this to handle Privacy Guard instead of our one-off code
   which has a bunch of edge cases and can leave apps in a weird state.

Change-Id: I2f2ecd0b75ff51b44b1a6035189355d7bd63eaf4