To reproduce:
1) Open attached project and scene
2) Select Scripts in hierarchy
3) Make sure all 4 GUISkins are selected
4) Build and run on WebGL

Expected: All 5 lines are shown normally (you can see this when playing in Editor)
Actual: Line with Noto font is not showing chinese characters, only latin ones
Comparison screenshot: http://puu.sh/uAZb5/dee65a46d9.png

Reproduced in 5.3.7f1, 5.4.5f1, 5.5.2p2, 5.6.0b11
Tested in Chrome and Firefox