Bug: 13632164
Change-Id: Iba333db63558254d760fc80244b3c9753c26b069

Some were never closed, other closed twice. This change
makes all Cursor instances behave, having the #close()
call in a finally{} clause, and puts the burden of closing
the cursor squarely on the creator rather than in the
called methods.
There is however one exception that is beyond the scope
of this change: UserDictionarySettings have a Cursor
member, it's never closed, and fixing the problem is not
obvious. This change adds a TODO for now.

It's not very clear if this change actually helps with
bug#12670151, but it may be related and it's a good
think to do anyway.

Bug: 12670151
Change-Id: I87cc44387e7dee3da1488671b93a28d9d73f7dc0

This resulted in downloads not being correctly canceled.

Bug: 9715797
Change-Id: I786d869977df225f85cb69ec7ea9c96b039258fe

Change-Id: If2f7bd1346cc5085bf57645830f0faac44d017e4

Change-Id: I1c5b27c8edf231680edb8d96f63b9d04cfc6a6fa

This is a bit of a shot in the dark, as I really don't see how this
can happen, but this should fix it in the correct way no matter
how it's actually happening.

Bug: 9301836
Change-Id: I472865b7a78883942c9fd46773238c23788674f8

Bug: 9052555
Change-Id: I86e90488679a78a9f6e901b640025619293765a0

Bug: 8651863
Change-Id: I748f35726d72ede926d5b06ed87ff029317f1ac3

Bug: 7600384
Change-Id: Ic5dbbbbcf19d778dde1316ebb417f1a8ede2d25d

Bug: 8161354
Change-Id: I17c23f56dd3bc2f27726556bf2c5a9d5520bd172