Index properly in clearErrors

[vidartf]

I assume this line needs indexing:

for (var ii = 0; ii < k.length; ++ii) {
-    delete glErrorShadow_[k];
+    delete glErrorShadow_[k[ii]];
}

[zhenyao]

Right. Thanks for catching this. Can you upload a pull request to fix it?

[vidartf]

Submitted in #5. Just wasn't sure if this was the right place to submit it, since the major commit says this is a copy of content from another repository.

[zhenyao]

@kenrussell Do you know if we can directly modify this or we need to update an upstream repo?

[kenrussell]

Sorry for the delay replying. This repository can be updated directly. It's pulled in to KhronosGroup/WebGL as a git submodule.