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listener is registered.

If an extension registers an OnDeterminingFilename listener,
download.filename will be ignored as the listeners will provide
the filename.

BUG=1106297

Change-Id: Id44f5c7043f0e899f33f53f80458a00b162e5c99
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2318445
Commit-Queue: Min Qin <qinmin@chromium.org>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792769}