Fix an issue that DownloadFilePicker is not calling LisenerDestroyed in dtor
DownloadFilePicker is a lisener of SelectFileDialog. When it creates a SelectFileDialog, it should inform the latter when it is killed. Otherwise, SelectFileDialog might hit NPE when calling the listener method. BUG=818066 Change-Id: Idc5e67b5cba9eac5f72b8e7a2df1ca70f2adbd8e Reviewed-on: https://chromium-review.googlesource.com/949099Reviewed-by:David Trainor <dtrainor@chromium.org> Reviewed-by:
Joy Ming <jming@chromium.org> Commit-Queue: Min Qin <qinmin@chromium.org> Cr-Commit-Position: refs/heads/master@{#541013}
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