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ChromeDownloadManagerDelegate is owned by DownloadCoreServiceImpl.
So it may outlive DownloadManagerImpl. This CL fixes the use-after-free
issue by checking whether DownloadManagerImpl is still alive.

BUG=1142069

Change-Id: I6d7e39c3911ec6a27be3d8a99463929cc2a45527
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2504591Reviewed-by: Xing Liu <xingliu@chromium.org>
Reviewed-by: Daniel Rubery <drubery@chromium.org>
Commit-Queue: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821544}