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If no option has been selected and no option has been get focused by spatial navigation,
"active_selection_end_" has "null" value.

So, direct access to "active_selection_end_" seems unsafe.
The bug only reproduces if no prior selection has been made (=> active_selection_end_ has not been set).

In order to prevent this crash, I added validating of "active_selection_end_" and used "NextSelectableOption()"

The existing "snav-multiple-select.html" conduct test for option selection after focus moving test, so it does not cause crash.
So I added a TC for ensure the operation for selecting options.


Bug: 1006116
Change-Id: Iec277b52272ec1491749b14ec4720f3ff0e578c5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1820924
Commit-Queue: Jeonghee Ahn <jeonghee27.ahn@lge.com>
Reviewed-by: Fredrik Söderquist <fs@opera.com>
Cr-Commit-Position: refs/heads/master@{#700196}