arc: Fix crash in arc_process_task.cc during browser shutdown
Since TaskManagerImpl is destructed after ~ArcServiceManager is called, we need to check the return value from the getter. BUG=680301 TEST=1) try, 2) sign in, wait for ARC boot, press Search+ESC, press Ctrl+Shift+QQ to sign out, confirm the browser does not crash Review-Url: https://codereview.chromium.org/2625823005 Cr-Commit-Position: refs/heads/master@{#443304}
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