MountService listeners can not be unregistered

When unregistering MountService listeners, their Binder proxy
objects were compared to registered listeners instead of their
backing objects.

Change-Id: Ie98a686b1d17544f1eda59fb3eb0dc02d836c1b2
Add NULL check in updateProxyConfig

If the exclusionList was null in updateProxyConfig the VM would
crash when converting it to a UTF8 string. Avoid this by adding a
null check.

Change-Id: I0d8106fd54385bd9ae9c652a6c67d459a119cf2b
Fix preference puts with "null" values.

Null values were being written out as <null /> elements in the
XML prefs file (as expected). This allowed the getFoo() functions
to work correctly because they treated null values as missing mappings
but containsKey would fail.

bug: https://code.google.com/p/android/issues/detail?id=64563
Change-Id: I1f466d01db96bf26e208d4fed3a6f257228bea5d
Merge "Fix preference puts with "null" values."
Merge "MountService listeners can not be unregistered"
Hide AssetInputStream.getAssetInt.

It returns a pointer to a private data structure, so there's
no sensible use for it. Also, the emergence of 64 bit processors
means that the return value isn't wide enough to represent
values in the native heap.

(cherry picked from commit f8f09a15a409f373f22aa475bb0defd264088e4f)

Change-Id: I9c9b5bae6db8638e65dda60f924aa3dddd06813a
Merge "Hide AssetInputStream.getAssetInt."
Revert "Hide AssetInputStream.getAssetInt."

This reverts commit 842d44ec1765e01f4a37af99cc1935b4d0399758.

Change-Id: I188e49d3651fd4941491c239b6a7c9f475995187
Merge "Revert "Hide AssetInputStream.getAssetInt.""
Merge "Add NULL check in updateProxyConfig"