GitLab

Changing the SafeXmlParser so it ignores nodes like DTDs and processing
instructions.

Bug: 789838
Change-Id: I0bf4a07509309f9e7720fdcea6283542a0b489ff
Reviewed-on: https://chromium-review.googlesource.com/804946Reviewed-by: Scott Graham <scottmg@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Jay Civelli <jcivelli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521392}