More work on device admins:

- You can now show a dynamic message to the user when asking to
  have your DeviceAdmin added.
- A DeviceAdmin can now provide a warning message that is displayed
  before a user disables it.
- Better ordering (and text) of the policy warnings.
- New API to set the maximum failed password attempts before the device
  wipes itself.
- We now store the number of failed unlock attempts in persistent
  storage.
- New managed dialog APIs that will be used by the settings app.

Also a little bit of cleanup as I was working on this - removed the
long unused MailboxNotAvailableException, fixed a java doc in Messenger.
diff --git a/Android.mk b/Android.mk
index 5f9bea4..7520afe 100644
--- a/Android.mk
+++ b/Android.mk
@@ -117,6 +117,7 @@
 	core/java/android/os/IParentalControlCallback.aidl \
 	core/java/android/os/IPermissionController.aidl \
 	core/java/android/os/IPowerManager.aidl \
+    core/java/android/os/IRemoteCallback.aidl \
 	core/java/android/os/IVibratorService.aidl \
     core/java/android/service/wallpaper/IWallpaperConnection.aidl \
     core/java/android/service/wallpaper/IWallpaperEngine.aidl \