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The renderer now checks for empty as well as null strings.
Crashing if an empty string is presented to the browser-side is
technically correct, but it is now  caught as a SecurityError in the
renderer first.

Bug: 830855
Change-Id: Id904864b8f6d57e9e0eb342d287337ba96d368d4
Reviewed-on: https://chromium-review.googlesource.com/1020187
Commit-Queue: Kim Paulhamus <kpaulhamus@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#552764}