Merge "Binder linkage no longer depends on JNI objrefs as persistent tokens"

     * Register the @a recipient for a notification if this binder

     * goes away.  If this binder object unexpectedly goes away

     * (typically because its hosting process has been killed),

     * then DeathRecipient::binderDied() will be called with a referene

     * then DeathRecipient::binderDied() will be called with a reference

     * to this.

     *

     * The @a cookie is optional -- if non-NULL, it should be a