1. Remove tag checker in HtmlTextPreference.
2. Set the max height for AnimatedImagePreference.
Bug: 149516547
Test: manaul test
Change-Id: I98f49d055db9427d91a3f1ca816e94a11d29cd3d
Merged-In: I98f49d055db9427d91a3f1ca816e94a11d29cd3d
(cherry picked from commit 10bc375176
)