Chrome Version: 66.0.3359.62/10452.28.0 beta channel Glimmer,Wolf,Banjo and Squawks
OS: Chrome

What steps will reproduce the problem?
(1)Sign into User ->Right click on screen and select 'Set Wallpaper' option
(2)In 'Set Wallpaper' overlay -> go to 'Custom' tab -> hover mouse on '+" Icon ('Choose File' option)and observe for Tool tip
(Please refer Video)

Expected: 'Choose File' too tip should be seen on hovering mouse pointer  on '+' Icon
Actual: Instead 'Choose File' too tip is seen missing

This is Non-Regression Issue seen from M-62

@wzang: Please confirm the Issue
 

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