Fix DDownArrowHeader_hintText_can't show

tower: https://tower.im/projects/8f19f0bf0e754f0b82ef2c24bc230973/todos/b07eb3df2095427cb7c7f1666fee8294/

Change-Id: I8cd729511abd4369bb2b4ec9d854856bd4730981
Merge "Fix DDownArrowHeader_hintText_can't show"