Fix tools/android_stack_parser/stack.
Fix tools/android_stack_parser/stack.

We no longer need to map libmojo_shell.so -> mojo_shell (since it's no
longer built as an executable).

R=qsr@chromium.org

Review URL: https://codereview.chromium.org/1089633002

afandria/mojo,afandria/mojo,collinjackson/mojo,afandria/mojo,afandria/mojo,jianglu/mojo,collinjackson/mojo,chinmaygarde/mojo,chinmaygarde/mojo,jianglu/mojo,afandria/mojo,collinjackson/mojo,chinmaygarde/mojo,afandria/mojo,afandria/mojo,chinmaygarde/mojo,collinjackson/mojo,afandria/mojo,chinmaygarde/mojo,collinjackson/mojo,chinmaygarde/mojo,collinjackson/mojo,jianglu/mojo,jianglu/mojo,chinmaygarde/mojo,chinmaygarde/mojo,jianglu/mojo,collinjackson/mojo,collinjackson/mojo,chinmaygarde/mojo,jianglu/mojo,collinjackson/mojo,jianglu/mojo,jianglu/mojo