gdb_dejagnu: Use TryAcquireMachine from run_dejagnu.

This fixes some gpylint warnings and uses TryAcquireMachine
from run_dejagnu.

BUG=None
TEST=gdb_dejagnu passes.

Change-Id: I1e7230b00619daec9cea28ca2926e18fb8ac8345
Reviewed-on: https://chrome-internal-review.googlesource.com/144426
Reviewed-by: Han Shen <shenhan@google.com>
Commit-Queue: Yunlian Jiang <yunlian@google.com>
Tested-by: Yunlian Jiang <yunlian@google.com>
1 file changed