Craig Mautner 3d7ca31c9e Remove AppWindowTokens from exiting apps with task
When the task is removed from a task stack in window manager any
exiting activities left in the stack were orphaned. This led to a
memory leak. Removing all task activities from those that are exiting
fixes this problem.

Fixes bug 18943737.

Change-Id: I0a5ea8d2d3be89af7ccaf01385a226a2eafdf507
2015-01-08 10:56:00 -08:00
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