Filling as a good first bug to learn workflows.

https://searchfox.org/mozilla-central/source/dom/canvas/WebGLContextGL.cpp#1266-1275
but not called anywhere.

As the change is trivial, it is just to learn how to contribute to Firefox.

Found by clang diag https://clang.llvm.org/docs/DiagnosticsReference.html#wunused-function

Tutorial to contribute:
https://firefox-source-docs.mozilla.org/tools/docs/contribute/how_to_contribute_firefox.html

Remove unused code from dom/canvas/WebGLContextGL.cpp

Hello Sylvestre,
I am new around here and saw this as good-first-bug.

I was asked by moz-phab for reviewers so I put in your nickname. My apologies if I was incorrect. Please let me know the correct way to find reviewers. (There are a lot of people who have worked on reviewing the previous commits on WebGLContextGL.cpp).

Looks great, bravo :)

https://hg.mozilla.org/mozilla-central/rev/f3ca8d3968fb