Extract nested classes from CallLogFragment.

This should help making the changes to the CallLogFragment easier to
make as there is less code around.

This has been done entired using Eclipse's refactoring with no manual
changes.

In the process, a couple of fields have been expanded from private to
package, because, while their were private, they were being used by
the parent/nested class anyway. I will fix those in a follow-up.

Bug: 5101753
Change-Id: Id46e18cfa86939100342daa020430063959dfcfc