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The spec suggests showing a broken image icon when and <img> element
has an alt text attribute but no src attribute. To avoid this, we
set the alt text only when we set the src of the img element.

BUG=773985
TEST=manual

Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I3884e736a8a7b0e3fa40ea483882d20916a81a00
Reviewed-on: https://chromium-review.googlesource.com/727107Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#510098}