Kasper Nilsson a742ae3999 Fix DOM traversal of copy process for comments
The comment selection process was being performed incorrectly due to
lack of utilization of Polymer.dom. This uncovered a few more issues
with the way the fake copy events in testing were being constructed and
a base case in comment text selection.

Bug: Issue 4674
Change-Id: I7e05b7ebe0bfd60bc9cc8973166685c24e25ab37
2016-10-04 17:57:23 -07:00
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