To reproduce:
1. Open repro project
2. Play in editor (until 12 messages will be posted to console)
3. Build and run scene for WebGL

Expected: Both times scene will be loaded, skybox will be shown
Actual: When the scene is built for WebGL, an error is thrown:
'Out of memory. If you are the developer of this content, try allocating more memory to your WebGL build in the WebGL player settings.'

Reproduced on: any 5.5, 5.6, 2017.1.0a2
Not reproducible: 2017.1.0b2, 2017.1.0f3, 2017.2.0a1-b2