Upon building project in WebGL Anti-Aliasing on RenderTexture stops functioning.

Steps to reproduce:

1. Set up RenderTexture object and camera.
2. Set Anti-aliasing on it to any value above "none"
3. Build in WebGL and open in browser.
4. Anti-aliasing ceases to function.

Expected outcome: Anti-aliasing would work in editor and any builds
Actual outcome: Anti-aliasing works in editor, PC build, but not WebGL

Tested on 5.4.0f3 and 2017.1.0a4

Note: Bug doesn't reproduce on latest version. Resolved as fixed.